GoldenEmperor1177 151631b8cf MDEV-31225 Crash converting IN with a nested ROW into IN subquery ...

What was wrong:
With in_predicate_conversion_threshold set low enough, an IN predicate
with a nested ROW, e.g.

  ROW(a,(a,a)) IN ((1,(1,1)),(2,(2,NULL)))

crashed the server. Before an IN list is converted into an IN subquery
over a table value constructor, cmp_row_types() checks every column
with subquery_type_allows_materialization(). With a nested ROW the
column is a ROW itself, and for a ROW that function must not be called.

How it is fixed:
A table value constructor cannot have a ROW as a column, so such a
predicate cannot be converted anyway. cmp_row_types() now reports the
columns as not comparable when either of them is a ROW, and the IN
predicate is evaluated without the conversion.

How it is tested:
Added a test to main.opt_tvc with IN and NOT IN over nested ROWs. It
crashes the server without the fix.

2026-10-09 14:13:59 +03:00

33 KiB

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