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failed in write_block_record on temporary table
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
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