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MDEV-24487 Error after update to 10.5.8 on CentOS-8: DBD::mysql::st execute failed: Unknown MySQL error

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The problem happened because the the new client capability flag
CLIENT_EXTENDED_METADATA was not put into the cache entry key.
So results cached by a new client were sent to the old client (and vica versa)
with a mis-matching metadata, which made the client abort the connection on
an unexpected result set metadata packet format.

The problem was caused by the patch for:
  MDEV-17832 Protocol: extensions for Pluggable types and JSON, GEOMETRY
which forgot to adjust the query cache code.

Fix:

- Adding a new member Query_cache_query_flags::client_extended_metadata,
  so only clients with equal CLIENT_EXTENDED_METADATA flag values can
  reuse results.

- Adding a new column CLIENT_EXTENDED_METADATA into
  INFORMATION_SCHEMA.QUERY_CACHE_INFO (privided by the qc_info plugin).
This commit is contained in:
Alexander Barkov
2022-01-27 15:54:20 +04:00
parent 4d74bac8bc
commit 430d60d1fc
6 changed files with 27 additions and 16 deletions
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1
sql/sql_cache.h
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@ -549,6 +549,7 @@ struct Query_cache_query_flags
{
unsigned int client_long_flag:1;
unsigned int client_protocol_41:1;
unsigned int client_extended_metadata:1;
unsigned int client_depr_eof:1;
unsigned int protocol_type:2;
unsigned int more_results_exists:1;