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MDEV-26145: Incorrect metadata is sent on running query with union in PS mode

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Test cases like the following one produce different result sets if it's run
with and without th option --ps-protocol.

CREATE TABLE t1(a INT);
--enable_metadata
(SELECT MAX(a) FROM t1) UNION (SELECT MAX(a) FROM t1);
--disable_metadata
DROP TABLE t1;

Result sets differ in metadata for the query
  (SELECT MAX(a) FROM t1) UNION (SELECT MAX(a) FROM t1);

The reason for different content of query metadata is that for queries
with union the items being created on JOIN preparing phase is placed into
item_list from SELECT_LEX_UNIT whereas for queries without union item_list
from SELECT_LEX is used instead.
This commit is contained in:
Dmitry Shulga
2021-07-19 19:25:11 +07:00
parent c47e4aab62
commit bab989ab38
4 changed files with 81 additions and 1 deletions
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5
mysql-test/r/mysql_client_test.result
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@@ -126,6 +126,11 @@ Data:
EOF
mysql_stmt_next_result(): 0; field_count: 0
# ------------------------------------
# cat MYSQL_TMP_DIR/test_mdev26145.out.log
# ------------------------------------
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def MAX(a) MAX(a) 3 11 0 Y 32768 0 63
# ------------------------------------
SET @@global.general_log= @old_general_log;
SET @@global.slow_query_log= @old_slow_query_log;