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MDEV-20632: Recursive CTE cycle detection using CYCLE clause (nonstandard)

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Added CYCLE ... RESTRICT (nonstandard) clause to recursive CTE.
This commit is contained in:
Oleksandr Byelkin
2020-01-27 21:50:16 +01:00
parent a5584b13d1
commit 50c0939166
20 changed files with 619 additions and 147 deletions
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4
sql/sql_derived.cc
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@ -816,8 +816,8 @@ bool mysql_derived_prepare(THD *thd, LEX *lex, TABLE_LIST *derived)
if ((res= unit->prepare(derived, derived->derived_result, 0)))
goto exit;
if (derived->with &&
(res= derived->with->rename_columns_of_derived_unit(thd, unit)))
goto exit;
(res= derived->with->process_columns_of_derived_unit(thd, unit)))
goto exit;
lex->context_analysis_only&= ~CONTEXT_ANALYSIS_ONLY_DERIVED;
if ((res= check_duplicate_names(thd, unit->types, 0)))
goto exit;