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org.apache.spark.sql.catalyst.analysis.resolver
CreateNamedStructResolver
Companion class CreateNamedStructResolver
object CreateNamedStructResolver
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- def cleanupAliases(createNamedStruct: CreateNamedStruct): CreateNamedStruct
For a query like:
For a query like:
SELECT STRUCT(1 AS a, 2 AS b)
CreateNamedStruct will be: CreateNamedStruct(Seq("a", Alias(1, "a"), "b", Alias(2, "b")))
Because inner aliases are not expected in the analyzed logical plan, we need to remove them here. However, we only do so if CreateNamedStruct is not directly under an Alias, in which case the removal will be handled by AliasResolver. This is because in single-pass, Alias is resolved after CreateNamedStruct and in order to compute the correct output name, it needs to know complete structure of the child.
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(Since version 9)