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  1. MariaDB Server
  2. MDEV-41850

FLOAT DEFAULT rounded in binlog's generated CREATE TABLE; replica diverges

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    Description

      The binary log's generated CREATE TABLE says DEFAULT 1; the replica stores a truncated value, because it actually overflows FLOAT.
      UUID converts the query to be logged in row format, triggering a show_create_table call, that's where FLOAT DEFAULT is truncated.

      --source include/have_binlog_format_mixed.inc
      		 
      --source include/master-slave.inc
      		 
      CREATE TABLE t (f FLOAT DEFAULT 1.0000001) SELECT LENGTH(UUID()) AS u;
      		 
      INSERT INTO t (u) VALUES (0);
      		 
      SELECT COUNT(*) FROM t WHERE f = 1;
      		 
      --sync_slave_with_master
      		 
      SELECT COUNT(*) FROM t WHERE f = 1;
      		 
      --connection master
      		 
      DROP TABLE t;
      		 
      --source include/rpl_end.inc

      Result (11.8.9):

      include/master-slave.inc
      		 
      [connection master]
      		 
      CREATE TABLE t (f FLOAT DEFAULT 1.0000001) SELECT LENGTH(UUID()) AS u;
      		 
      INSERT INTO t (u) VALUES (0);
      		 
      SELECT COUNT(*) FROM t WHERE f = 1;
      		 
      COUNT(*)
      		 
      0
      		 
      connection slave;
      		 
      SELECT COUNT(*) FROM t WHERE f = 1;
      		 
      COUNT(*)
      		 
      1
      		 
      connection master;
      		 
      DROP TABLE t;
      		 
      include/rpl_end.inc

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35753 Export/import does not round trip FLOAT values

          • Major - Major loss of function.
          • Open

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              Elkin Andrei Elkin
              nikitamalyavin Nikita Malyavin
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                Updated:

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