spark技术分享ListQuery Subquery Expression
ListQuery is a SubqueryExpression that represents SQL’s IN predicate with a subquery, e.g. NOT? IN '(' query ')'.
ListQuery cannot be evaluated and produce a value given an internal row.
ListQuery is resolved when:
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There is at least one child output attribute
Creating ListQuery Instance
ListQuery takes the following when created:
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Subquery logical plan
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Child expressions
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Expression ID (as
ExprIdand defaults to a new ExprId) -
Child output attributes
