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DeltaSqlParser

DeltaSqlParser is a SQL parser (Spark SQL's ParserInterface) for Delta SQL.

DeltaSqlParser is registered in a Spark SQL application using DeltaSparkSessionExtension.

Creating Instance

DeltaSqlParser takes the following to be created:

  • ParserInterface (to fall back to for unsupported SQL)

DeltaSqlParser is created when DeltaSparkSessionExtension is requested to register Delta SQL support.

DeltaSqlAstBuilder

DeltaSqlParser uses DeltaSqlAstBuilder to convert SQL statements to their runtime representation (as a LogicalPlan).

In case an AST could not be converted to a LogicalPlan, DeltaSqlAstBuilder requests the delegate ParserInterface to parse it.


Last update: 2020-09-24