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  1. MariaDB Server
  2. MDEV-15476

Inplace algorithm doesn't support changing virtual column datatype

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    Description

      Inplace algorithm doesn't support change of virtual column data type.

      --source include/have_innodb.inc
      		 
      create table t1(f1 int not null, f2 char(100) as ("test") virtual)engine=innodb;
      		 
      alter table t1 modify column f2 varchar(200) as ("db") virtual, algorithm=inplace;
      		 
      drop table t1;

      Above alter fails with the following error:

      failed: 1845: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY

      There is no reason mentioned why inplace fails. Above alter doesn't affect the data or rebuild
      the table. It should be part of INNOBASE_INPLACE_IGNORE flag. I think inplace should support this operation.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14046 Allow ALGORITHM=INPLACE for 10.1 tables that contain virtual columns

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14341 Allow LOCK=NONE in table-rebuilding ALTER when indexed virtual columns exist

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-16332 Allow ALGORITHM=NOCOPY or INSTANT for changes of virtual column type

          • Major - Major loss of function.
          • Confirmed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17468 Avoid table rebuild on operations on generated columns

          • Major - Major loss of function.
          • Stalled

          Bug - A problem which impairs or prevents the functions of the product. MDEV-19214 Virtual column type cannot be converted from one to another - unhelpful error message

          • Major - Major loss of function.
          • Open

          Activity

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            thiru Thirunarayanan Balathandayuthapani added a comment - 

            create table t1(f1 int not null, f2 int as (f1 * f1) virtual)engine=innodb;
            		 
            alter table t1 change f2 f2 int as (f1) virtual, algorithm=inplace;
            		 
            drop table t1;

            Above alter passes in inplace algorithm. Only difference here is datatype change flag enabled in the bug page testcase.
            I think it should be fixable in innodb itself.

            I have to change reported version to 10.1

            thiru Thirunarayanan Balathandayuthapani added a comment - create table t1(f1 int not null, f2 int as (f1 * f1) virtual)engine=innodb; alter table t1 change f2 f2 int as (f1) virtual, algorithm=inplace; drop table t1; Above alter passes in inplace algorithm. Only difference here is datatype change flag enabled in the bug page testcase. I think it should be fixable in innodb itself. I have to change reported version to 10.1
            thiru Thirunarayanan Balathandayuthapani added a comment - 

            --source include/have_innodb.inc
            		 
            create table t1(f1 int not null, f2 int as (f1) virtual, f3 int not null)engine=innodb;
            		 
            insert into t1(f1, f3) values(1, 1);
            		 
             
            		 
            alter table t1 modify column f2 int as (f1) virtual after f3, algorithm=inplace;
            		 
             
            		 
            drop table t1;

            The above alter fails in inplace. It doesn't make sense for these virtual column restriction.

            thiru Thirunarayanan Balathandayuthapani added a comment - --source include/have_innodb.inc create table t1(f1 int not null, f2 int as (f1) virtual, f3 int not null)engine=innodb; insert into t1(f1, f3) values(1, 1);   alter table t1 modify column f2 int as (f1) virtual after f3, algorithm=inplace;   drop table t1; The above alter fails in inplace. It doesn't make sense for these virtual column restriction.

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              thiru Thirunarayanan Balathandayuthapani
              thiru Thirunarayanan Balathandayuthapani
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