Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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5.3.12, 5.5.36, 10.0.10
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None
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None
Description
name resolution issues with views and multi-update in ps-protocol
Attachments
Issue Links
- blocks
-
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- Closed
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Activity
Preliminary analysis:
The cause for the ASSERT is that Item_field::fix_fields calls Item_field::fix_outer_field while it shouldn't call it at all. There is no outer context in this statement.
The reason for this call is that in the following block in Item_field::fix_fields:
table_list= (cached_table ? cached_table :
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from_field != view_ref_found ?
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from_field->table->pos_in_table_list : 0);
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if (!outer_fixed && table_list && table_list->select_lex &&
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context->select_lex &&
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table_list->select_lex != context->select_lex &&
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!context->select_lex->is_merged_child_of(table_list->select_lex) &&
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is_outer_table(table_list, context->select_lex))
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{
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int ret;
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if ((ret= fix_outer_field(thd, &from_field, reference)) < 0)
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goto error;
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outer_fixed= 1;
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if (!ret)
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goto mark_non_agg_field;
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}
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The sub-condition:
table_list->select_lex != context->select_lex
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is TRUE.
The following comparison of the prepare/execution of MariaDB with and without prepared statement, and MySQL
makes me think that the reason for this discrepancy is in either:
- some of the name resolution state is lost (e.g. not saved/restored) between prepare and execute, or
- the execute phase doesn't repeat correctly some the name resolution steps needed to reproduce the same result that was produced during prepare.
Let's follow the execution state of MySQL just at the questionable condition above. The below trace shows that both during prepare and execute:
- All tables considered during name resolution belong to the top-most select_lex (parent == NULL),
- (cached_table->select_lex == context->select_lex) is always true.
====================================== BEGIN PREPARE ======================================(gdb) echo
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(gdb) c
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d79dd0, thd=0x3557470, reference=0x3d7c8e0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d79ef0 "val2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb) c
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d78240, thd=0x3557470, reference=0x3d78400) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d78238 "val2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d77ca8 "v2"
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(gdb)
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d7a550, thd=0x3557470, reference=0x3d7a810) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d7a548 "id2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb)
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d7c5d0, thd=0x3557470, reference=0x3d7c8b0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d7c6f0 "id1v1"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d7c870 "t1"
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(gdb)
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d7a668, thd=0x3557470, reference=0x3d7a818) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d7a660 "id1v1"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d7a4f0 "v1"
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(gdb)
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d79c90, thd=0x3557470, reference=0x3d7c8d0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d79db0 "id2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb)
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d784c8, thd=0x3557470, reference=0x3d78678) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d784c0 "id2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d77ca8 "v2"
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(gdb)
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Continuing.
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C-c C-c
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Program received signal SIGINT, Interrupt.
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0x00007f2060f93f7d in poll () from /lib/x86_64-linux-gnu/libc.so.6
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====================================== BEGIN EXEC ======================================(gdb) echo
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(gdb) c
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d79dd0, thd=0x3557470, reference=0x3d7c8e0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d79ef0 "val2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb) c
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d78240, thd=0x3557470, reference=0x3d78400) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d78238 "val2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d77ca8 "v2"
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(gdb)
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d79c90, thd=0x3557470, reference=0x3d7c8d0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d79db0 "id2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb)
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Continuing.
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|
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Breakpoint 1, Item_field::fix_fields (this=0x3d784c8, thd=0x3557470, reference=0x3d78678) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d784c0 "id2v2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d77ca8 "v2"
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(gdb)
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d7a550, thd=0x3557470, reference=0x3d7a810) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d7a548 "id2"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d79f30 "t2"
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(gdb)
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d7c5d0, thd=0x3557470, reference=0x3d7c8b0) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = false
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3: item_name->m_str = 0x3d7c6f0 "id1v1"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d7c870 "t1"
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(gdb)
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Continuing.
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Breakpoint 1, Item_field::fix_fields (this=0x3d7a668, thd=0x3557470, reference=0x3d7a818) at /home/tsk/mprog/src/mysql-server/sql/item.cc:5441
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8: context->select_lex->master->master = (SELECT_LEX *) 0x0
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7: cached_table->select_lex->master->master = (SELECT_LEX *) 0x0
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5: cached_table->select_lex = (st_select_lex *) 0x3d77378
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4: (from_field == view_ref_found) = true
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3: item_name->m_str = 0x3d7a660 "id1v1"
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2: (cached_table->select_lex == context->select_lex) = true
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1: cached_table->alias = 0x3d7a4f0 "v1"
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(gdb)
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Continuing.
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Let's follow the prepare/execute state at the same point in MariaDB. Notice that execute stops already at the first field "id1v1" to be resolved because of the failing assert.
Also notice that:
- (table_list->select_lex == context->select_lex) is TRUE during the prepare phase for all considered tables/contexts.
- However during execute the above condition is wrong already for the first found field, and this is the cause for the bug.
- Unlike MySQL the select_lex-es where the considered tables/contexts belong are not at the top-level, they have a parent.
- Even more, during the execute phase
cached_table->select_lex->master->master == context->select_lex(which seems wrong, and inconsistent with all other traces).
The above states are very different from MySQL, and it seems MariaDB has diverged in the shape of the select_lex tree for merged views. Therefore I think it makes little sense to try to apply patches from MySQL.
====================================== BEGIN PREPARE ======================================
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eef6e8, thd=0x7f383cbd2070, reference=0x7f3835eef7f8) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835eee9f8
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11: context->select_lex = (st_select_lex *) 0x7f3835eee9f8
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10: context = (Name_resolution_context *) 0x7f3835eeea48
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9: context->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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7: (from_field == view_ref_found) = false
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6: cached_table->alias = 0x7f3835eef978 "t2"
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5: field_name = 0x7f3835eef6e0 "id2"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835eef978 "t2"
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2: name = 0x7f3835eef800 "id2v2"
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(gdb) c
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Continuing.
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|
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eef820, thd=0x7f383cbd2070, reference=0x7f3835eef930) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835eee9f8
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11: context->select_lex = (st_select_lex *) 0x7f3835eee9f8
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10: context = (Name_resolution_context *) 0x7f3835eeea48
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9: context->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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7: (from_field == view_ref_found) = false
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6: cached_table->alias = 0x7f3835eef978 "t2"
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5: field_name = 0x7f3835eef818 "val2"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835eef978 "t2"
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2: name = 0x7f3835eef938 "val2v2"
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(gdb)
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Continuing.
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|
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eebca0, thd=0x7f383cbd2070, reference=0x7f3835eebf30) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835eee9f8
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11: context->select_lex = (st_select_lex *) 0x7f3835eee9f8
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10: context = (Name_resolution_context *) 0x7f3835eeea48
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9: context->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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7: (from_field == view_ref_found) = false
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6: cached_table->alias = 0x7f3835eef978 "t2"
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5: field_name = 0x7f3835eefff8 "id2"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835eef978 "t2"
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2: name = 0x7f3835eefff8 "id2"
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(gdb)
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Continuing.
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|
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eec728, thd=0x7f383cbd2070, reference=0x7f3835eecfd0) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835ef4838
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11: context->select_lex = (st_select_lex *) 0x7f3835ef4838
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10: context = (Name_resolution_context *) 0x7f3835ef4888
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9: context->select_lex->master->master = (st_select_lex *) 0x7f3835eee9f8
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835eee9f8
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7: (from_field == view_ref_found) = false
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6: cached_table->alias = 0x7f3835eec9b8 "t1"
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5: field_name = 0x7f3835eec720 "id1"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835eec9b8 "t1"
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2: name = 0x7f3835eec840 "id1v1"
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(gdb)
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Continuing.
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|
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eebda0, thd=0x7f383cbd2070, reference=0x7f3835eebf38) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835eee9f8
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11: context->select_lex = (st_select_lex *) 0x7f3835eee9f8
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10: context = (Name_resolution_context *) 0x7f3835eeea48
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9: context->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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7: (from_field == view_ref_found) = true
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6: cached_table->alias = 0x7f3835eeffa0 "v1"
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5: field_name = 0x7f3835ef0008 "id1v1"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835eeffa0 "v1"
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2: name = 0x7f3835ef0008 "id1v1"
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(gdb)
|
Continuing.
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|
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835ef2b80, thd=0x7f383cbd2070, reference=0x7f3835ef2d28) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835ef1840
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11: context->select_lex = (st_select_lex *) 0x7f3835ef1840
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10: context = (Name_resolution_context *) 0x7f3835ef1890
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9: context->select_lex->master->master = (st_select_lex_node *) 0x0
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8: cached_table->select_lex->master->master = (st_select_lex_node *) 0x0
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7: (from_field == view_ref_found) = true
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6: cached_table->alias = 0x7f3835ef2580 "v2"
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5: field_name = 0x7f3835ef2b78 "val2v2"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835ef2580 "v2"
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2: name = 0x7f3835ef2b78 "val2v2"
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(gdb)
|
Continuing.
|
|
|
Breakpoint 9, Item_field::fix_fields (this=0x7f3835ef2de0, thd=0x7f383cbd2070, reference=0x7f3835ef2f78) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835ef1840
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11: context->select_lex = (st_select_lex *) 0x7f3835ef1840
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10: context = (Name_resolution_context *) 0x7f3835ef1890
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9: context->select_lex->master->master = (st_select_lex_node *) 0x0
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8: cached_table->select_lex->master->master = (st_select_lex_node *) 0x0
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7: (from_field == view_ref_found) = true
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6: cached_table->alias = 0x7f3835ef2580 "v2"
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5: field_name = 0x7f3835ef2dd8 "id2v2"
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4: (table_list->select_lex == context->select_lex) = true
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3: table_list->alias = 0x7f3835ef2580 "v2"
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2: name = 0x7f3835ef2dd8 "id2v2"
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(gdb)
|
Continuing.
|
|
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====================================== BEGIN EXEC ======================================
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Breakpoint 9, Item_field::fix_fields (this=0x7f3835eec728, thd=0x7f383cbd2070, reference=0x7f3835eec838) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3835ef4838
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11: context->select_lex = (st_select_lex *) 0x7f3835ef1840
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10: context = (Name_resolution_context *) 0x7f3835ef7480
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9: context->select_lex->master->master = (st_select_lex_node *) 0x0
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8: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3835ef1840
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7: (from_field == view_ref_found) = false
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6: cached_table->alias = 0x7f3835eec9b8 "t1"
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5: field_name = 0x7f3835eec720 "id1"
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4: (table_list->select_lex == context->select_lex) = false
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3: table_list->alias = 0x7f3835eec9b8 "t1"
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2: name = 0x7f3835eec840 "id1v1"
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Finally, let's follow the state at the same point when the statement is executed directly in MariaDB. A comparison of these states with the recoreded steps of the prepare phase for MariaDB, it is clear that prepare and direct execution work the same.
====================================== BEGIN ======================================
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a99f68, thd=0x7f3bdf7c1070, reference=0x7f3bd8a9a078) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bd8af2838
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11: context->select_lex = (st_select_lex *) 0x7f3bd8af2838
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10: context = (Name_resolution_context *) 0x7f3bd8af2888
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9: field_name = 0x7f3bd8a99f60 "id2"
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8: context->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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7: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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6: (table_list->select_lex == context->select_lex) = true
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5: (from_field == view_ref_found) = false
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2: table_list->alias = 0x7f3bd8a9a1f8 "t2"
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1: name = 0x7f3bd8a9a080 "id2v2"
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(gdb) c
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Continuing.
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|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a9a0a0, thd=0x7f3bdf7c1070, reference=0x7f3bd8a9a1b0) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bd8af2838
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11: context->select_lex = (st_select_lex *) 0x7f3bd8af2838
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10: context = (Name_resolution_context *) 0x7f3bd8af2888
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9: field_name = 0x7f3bd8a9a098 "val2"
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8: context->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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7: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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6: (table_list->select_lex == context->select_lex) = true
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5: (from_field == view_ref_found) = false
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2: table_list->alias = 0x7f3bd8a9a1f8 "t2"
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1: name = 0x7f3bd8a9a1b8 "val2v2"
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(gdb)
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Continuing.
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|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a9ae58, thd=0x7f3bdf7c1070, reference=0x7f3bd8af3b40) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bd8af2838
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11: context->select_lex = (st_select_lex *) 0x7f3bd8af2838
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10: context = (Name_resolution_context *) 0x7f3bd8af2888
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9: field_name = 0x7f3bd8a9ae50 "id2"
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8: context->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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7: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
|
6: (table_list->select_lex == context->select_lex) = true
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5: (from_field == view_ref_found) = false
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2: table_list->alias = 0x7f3bd8a9a1f8 "t2"
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1: name = 0x7f3bd8a9ae50 "id2"
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(gdb)
|
Continuing.
|
|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8af3e10, thd=0x7f3bdf7c1070, reference=0x7f3bd8b08018) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bd8b06d70
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11: context->select_lex = (st_select_lex *) 0x7f3bd8b06d70
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10: context = (Name_resolution_context *) 0x7f3bd8b06dc0
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9: field_name = 0x7f3bd8af3e08 "id1"
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8: context->select_lex->master->master = (st_select_lex *) 0x7f3bd8af2838
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7: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3bd8af2838
|
6: (table_list->select_lex == context->select_lex) = true
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5: (from_field == view_ref_found) = false
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2: table_list->alias = 0x7f3bd8b07a00 "t1"
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1: name = 0x7f3bd8af3f28 "id1v1"
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(gdb)
|
Continuing.
|
|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a9af68, thd=0x7f3bdf7c1070, reference=0x7f3bd8af3b48) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bd8af2838
|
11: context->select_lex = (st_select_lex *) 0x7f3bd8af2838
|
10: context = (Name_resolution_context *) 0x7f3bd8af2888
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9: field_name = 0x7f3bd8a9af60 "id1v1"
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8: context->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
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7: cached_table->select_lex->master->master = (st_select_lex *) 0x7f3bdf7c5460
|
6: (table_list->select_lex == context->select_lex) = true
|
5: (from_field == view_ref_found) = true
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2: table_list->alias = 0x7f3bd8a9a820 "v1"
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1: name = 0x7f3bd8a9af60 "id1v1"
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(gdb)
|
Continuing.
|
|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a99788, thd=0x7f3bdf7c1070, reference=0x7f3bd8a99930) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bdf7c5460
|
11: context->select_lex = (st_select_lex *) 0x7f3bdf7c5460
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10: context = (Name_resolution_context *) 0x7f3bdf7c54b0
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9: field_name = 0x7f3bd8a99780 "val2v2"
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8: context->select_lex->master->master = (st_select_lex_node *) 0x0
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7: cached_table->select_lex->master->master = (st_select_lex_node *) 0x0
|
6: (table_list->select_lex == context->select_lex) = true
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5: (from_field == view_ref_found) = true
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2: table_list->alias = 0x7f3bd8a99188 "v2"
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1: name = 0x7f3bd8a99780 "val2v2"
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(gdb)
|
Continuing.
|
|
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Breakpoint 8, Item_field::fix_fields (this=0x7f3bd8a999e8, thd=0x7f3bdf7c1070, reference=0x7f3bd8a99b80) at /home/tsk/mprog/src/10.0-lp/sql/item.cc:5206
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12: cached_table->select_lex = (st_select_lex *) 0x7f3bdf7c5460
|
11: context->select_lex = (st_select_lex *) 0x7f3bdf7c5460
|
10: context = (Name_resolution_context *) 0x7f3bdf7c54b0
|
9: field_name = 0x7f3bd8a999e0 "id2v2"
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8: context->select_lex->master->master = (st_select_lex_node *) 0x0
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7: cached_table->select_lex->master->master = (st_select_lex_node *) 0x0
|
6: (table_list->select_lex == context->select_lex) = true
|
5: (from_field == view_ref_found) = true
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2: table_list->alias = 0x7f3bd8a99188 "v2"
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1: name = 0x7f3bd8a999e0 "id2v2"
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It is outer table detection fix
=== modified file 'sql/item.cc'
— sql/item.cc 2014-03-16 20:03:01 +0000
+++ sql/item.cc 2014-04-16 19:24:35 +0000
@@ -4336,6 +4336,10 @@ bool is_outer_table(TABLE_LIST *table, S
DBUG_ASSERT(table->select_lex != select);
TABLE_LIST *tl;
+ if (table->belong_to_view &&
+ table->belong_to_view->select_lex == select)
+ return FALSE;
+
for (tl= select->master_unit()->derived;
tl && tl->is_merged_derived();
select= tl->select_lex, tl= select->master_unit()->derived)
But there is second problem with checking unique tables (in the same test suite)...
On second check (first execution after prepare) table t1 (part of v1) some how got the same table map (1) as t2/v2 which cause the false positive of the same table detection.
#Test case that fails with --ps-protocol
drop database if exists test;
create database test;
use test;
create table t1 (id1 int primary key, val1 varchar(20));
insert into t1 values (1, 'test1');
create table t2 (id2 int primary key, val2 varchar(20));
insert into t2 values (1, 'test2');
create algorithm=merge view v1 as select id1 as id1v1, val1 as val1v1 from t1;
create algorithm=merge view v2 as
select t2.id2 as id2v2, t2.val2 as val2v2
from t2, v1
where t2.id2 = v1.id1v1;
– The crash query
prepare stmt1 from "update v2 set val2v2 = 'test19' where 1 = id2v2";
execute stmt1;
– A similar select that works
prepare stmt2 from "select val2v2 from v2 where val2v2 = 'test19' and 1 = id2v2";
execute stmt2;