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class IdentifierAndCteSubstitutor extends AnyRef

The IdentifierAndCteSubstitutor is responsible for substituting the IDENTIFIERs (not yet implemented) and CTE references in the unresolved logical plan before the actual resolution starts (specifically before metadata resolution). This is important for SQL features like WITH (that could confuse MetadataResolver with extra UnresolvedRelations) or IDENTIFIER (that "hides" the actual UnresolvedRelations).

We only recurse into the plan if IdentifierAndCteSubstitutor.NODES_OF_INTEREST are present. This is done so that IdentifierAndCteSubstitutor is fast and not invasive.

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  1. new IdentifierAndCteSubstitutor()

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  14. def substitutePlan(unresolvedPlan: LogicalPlan): LogicalPlan

    This is the main entry point to the substitution process.

    This is the main entry point to the substitution process. It takes unresolvedPlan and substitutes CTEs and IDENTIFIERs (not yet implemented) that would otherwise confuse the metadata resolution process.

    CteRegistry has to be reset for each new invocation, because CTEs in views are analyzed in isolation.

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    (Since version 9)

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