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MDEV-20818 ER_CRASHED_ON_USAGE or Assertion `length <= column->length' failed in write_block_record on temporary table

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The patch for `MDEV-20795 CAST(inet6 AS BINARY) returns wrong result`
unintentionally changed what Item_char_typecast::type_handler()
returns. This broke UNIONs with the BINARY() function, as the Aria
engine started to get columns of unexpected data types.

Restoring previous behaviour, to return
  Type_handler::string_type_handler(max_length).

The prototype for Item_handed_func::return_type_handler() has changed
from:
  const Type_handler *return_type_handler() const
to:
  const Type_handler *return_type_handler(const Item_handled_func *) const
This commit is contained in:
Alexander Barkov
2019-10-14 08:21:08 +04:00
parent fa8437908b
commit 5392726e3c
9 changed files with 171 additions and 18 deletions
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14
mysql-test/main/xml.test
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@ -782,3 +782,17 @@ DROP TABLE t1;
--echo #
--echo # End of 10.2 tests
--echo #
--echo #
--echo # Start of 10.5 tests
--echo #
--echo #
--echo # MDEV-20818 ER_CRASHED_ON_USAGE or Assertion `length <= column->length' failed in write_block_record on temporary table
--echo #
SELECT 'foo' AS f UNION SELECT BINARY( UpdateXML('<a></a>', '/a', '<b></b>')) AS f;
--echo #
--echo # Start of 10.5 tests
--echo #