[fix](nereids)NullSafeEqualToEqual rule should keep <=> unchanged if it has none-literal child #36523
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…it has none-literal child
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pick from master #36521
convert:
expr <=> null to expr is null
null <=> null to true
null <=> 1 to false
literal <=> literal to literal = literal ( 1 <=> 2 to 1 = 2 )
others are unchanged.
Proposed changes
Issue Number: close #xxx