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SQL: implement null safe equality operator <=> #35871

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matriv opened this issue Nov 23, 2018 · 1 comment
Closed

SQL: implement null safe equality operator <=> #35871

matriv opened this issue Nov 23, 2018 · 1 comment
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:Analytics/SQL SQL querying >enhancement v6.6.0 v7.0.0-beta1

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@matriv
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matriv commented Nov 23, 2018

Null safe equality operator <=> is used by MySQL
and always returns either TRUE or FALSE even if the operants are null:

'foo' <=> null => false
null <=> 'bar'  => false
null <=> null => true

Relates to: #34956
@matriv matriv self-assigned this Nov 23, 2018
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matriv added a commit to matriv/elasticsearch that referenced this issue Nov 23, 2018
@matriv
SQL: Implement null safe equality operator <=>
9b87dff 
This operator handles nulls in different way than the normal `=`.
If one of the operants is `null` and the other not it returns `false`.
If both operants are `null` it returns `true`. Therefore in contrary to
`=`, which returns `null` if at least one of the operants is `null`, this one
never returns `null` as a result.

Closes: elastic#35871
@matriv matriv mentioned this issue Nov 23, 2018
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matriv added a commit that referenced this issue Nov 26, 2018
@matriv
SQL: Implement null safe equality operator <=> (#35873)
b078e29 
This operator handles nulls in different way than the normal `=`.
If one of the operants is `null` and the other not it returns `false`.
If both operants are `null` it returns `true`. Therefore in contrary to
`=`, which returns `null` if at least one of the operants is `null`, this one
never returns `null` as a result.

Closes: #35871
matriv added a commit that referenced this issue Nov 26, 2018
@matriv
SQL: Implement null safe equality operator <=> (#35873)
4ecfecf 
This operator handles nulls in different way than the normal `=`.
If one of the operants is `null` and the other not it returns `false`.
If both operants are `null` it returns `true`. Therefore in contrary to
`=`, which returns `null` if at least one of the operants is `null`, this one
never returns `null` as a result.

Closes: #35871
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:Analytics/SQL SQL querying >enhancement v6.6.0 v7.0.0-beta1
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