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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

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              thiru Thirunarayanan Balathandayuthapani
              thiru Thirunarayanan Balathandayuthapani
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