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Valgrind reports an uninitialized value problem when running this query:
SELECT AsText(g) FROM (SELECT NULL AS g UNION SELECT Point(1,1)) AS t1;
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==1322== Thread 6:
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==1322== Conditional jump or move depends on uninitialised value(s)
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==1322== at 0x90FA60: Field_geom::geometry_type_merge(Field::geometry_type, Field::geometry_type) (field.cc:8605)
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==1322== by 0x959C1E: Item_type_holder::join_types(THD*, Item*) (item.cc:10184)
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==1322== by 0x7962EE: st_select_lex_unit::prepare(THD*, select_result*, unsigned long) (sql_union.cc:635)
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==1322== by 0x680FA4: mysql_derived_prepare(THD*, LEX*, TABLE_LIST*) (sql_derived.cc:726)
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==1322== by 0x67FFD6: mysql_handle_single_derived(LEX*, TABLE_LIST*, unsigned int) (sql_derived.cc:197)
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==1322== by 0x7BE93F: TABLE_LIST::handle_derived(LEX*, unsigned int) (table.cc:7729)
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==1322== by 0x6A10D0: st_select_lex::handle_derived(LEX*, unsigned int) (sql_lex.cc:3886)
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==1322== by 0x6F0311: JOIN::prepare(TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, bool, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*) (sql_select.cc:712)
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==1322== by 0x6FAA85: mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3636)
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==1322== by 0x6EF4F6: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:373)
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==1322== by 0x6BACE8: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6431)
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==1322== by 0x6B0A36: mysql_execute_command(THD*) (sql_parse.cc:3448)
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==1322== by 0x6BE670: mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) (sql_parse.cc:7874)
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==1322== by 0x6AC46F: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) (sql_parse.cc:1812)
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==1322== by 0x6AADD8: do_command(THD*) (sql_parse.cc:1362)
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==1322== by 0x7FA697: do_handle_one_connection(CONNECT*) (sql_connect.cc:1354)
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This patch fixes the problem:
--- a/sql/item.cc
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+++ b/sql/item.cc
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@@ -10035,7 +10035,8 @@ void Item_cache_row::set_null()
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Item_type_holder::Item_type_holder(THD *thd, Item *item)
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:Item(thd, item),
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Type_handler_hybrid_real_field_type(get_real_type(item)),
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- enum_set_typelib(0)
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+ enum_set_typelib(0),
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+ geometry_type(Field::GEOM_GEOMETRY)
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{
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DBUG_ASSERT(item->fixed);
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maybe_null= item->maybe_null;
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However, one more related problem remains. Note, this script:
CREATE OR REPLACE TABLE t1 AS SELECT NULL AS g UNION SELECT Point(1,1);
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creates a column of the GEOMETRY type, with and without the above patch. It should create a column of the POINT type instead.
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