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[MySQL] Dbz crashed on parsing MySQL DDL statement including "SELECT 1 + @sum:=1 AS ss;" #3661

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Aug 13, 2023
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[MySQL] Dbz crashed on parsing MySQL DDL statement including "SELECT 1 + @sum:=1 AS ss;" #3661

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3 changes: 2 additions & 1 deletion sql/mysql/Positive-Technologies/MySqlParser.g4
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Original file line number Diff line number Diff line change
Expand Up @@ -2615,8 +2615,8 @@ predicate
| predicate SOUNDS LIKE predicate #soundsLikePredicate
| predicate NOT? LIKE predicate (ESCAPE STRING_LITERAL)? #likePredicate
| predicate NOT? regex=(REGEXP | RLIKE) predicate #regexpPredicate
| (LOCAL_ID VAR_ASSIGN)? expressionAtom #expressionAtomPredicate
| predicate MEMBER OF '(' predicate ')' #jsonMemberOfPredicate
| expressionAtom #expressionAtomPredicate
;


Expand All @@ -2629,6 +2629,7 @@ expressionAtom
| mysqlVariable #mysqlVariableExpressionAtom
| unaryOperator expressionAtom #unaryExpressionAtom
| BINARY expressionAtom #binaryExpressionAtom
| LOCAL_ID VAR_ASSIGN expressionAtom #variableAssignExpressionAtom
| '(' expression (',' expression)* ')' #nestedExpressionAtom
| ROW '(' expression (',' expression)+ ')' #nestedRowExpressionAtom
| EXISTS '(' selectStatement ')' #existsExpressionAtom
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14 changes: 13 additions & 1 deletion sql/mysql/Positive-Technologies/examples/dml_select.sql
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Expand Up @@ -232,4 +232,16 @@ SELECT *
NESTED PATH '$.b[*]' COLUMNS (b INT PATH '$')
)
) AS tt;

SELECT !(1 + @sum:=1) AS ss;
SELECT (@sum:=1 + 1) AS ss;
SELECT 1 + @sum:=1 AS ss;
SELECT 100 >> @sum:=1 AS ss;
SELECT @sum:=1 < 100 AS ss;
SELECT 100 and @sum:=1 AS ss;
SELECT
@sum := @sum + column_name AS running_sum
FROM
your_table,
(SELECT @sum := 0) AS init
ORDER BY
some_order_column;
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