In AS OF TIMESTAMP xxx, the TIMESTAMP is always parsed as a part of AS OF, even if it's actually a part of the expression (the complete expression being TIMESTAMP xxx).
Examples:
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DATETIME literal
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SELECT TIMESTAMP'2016-02-30 08:07:06';
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→ ERROR 1525 (HY000): Incorrect DATETIME value: '2016-02-30 08:07:06'
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SELECT * FROM t1 FOR SYSTEM_TIME AS OF TIMESTAMP'2016-02-30 08:07:06';
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→ ok
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SELECT * FROM t1 FOR SYSTEM_TIME AS OF (TIMESTAMP'2016-02-30 08:07:06');
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→ ERROR 1525 (HY000): Incorrect DATETIME value: '2016-02-30 08:07:06'
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two-argument TIMESTAMP() function
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SELECT TIMESTAMP('2003-12-31 12:00:00','12:00:00');
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→ ok
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SELECT * FROM t1 FOR SYSTEM_TIME AS OF TIMESTAMP('2003-12-31 12:00:00','12:00:00')
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→ ERROR 1241 (21000): Operand should contain 1 column(s)
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SELECT * FROM t1 FOR SYSTEM_TIME AS OF (TIMESTAMP('2003-12-31 12:00:00','12:00:00'));
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→ ok
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Bug
Critical
MDEV-15818 Fix shift-reduce conflicts in the new 10.3 syntax
