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* SQL: Remove instanceof checks for field retrieval This removes the `instanceof` checks iterating through the columns determining what fields need to be retrieved from the ES document. It adds an interface `FieldExtraction` that collects the fields needed in a builder. The builder can then build the fields necessary from a `SearchSourceBuilder`. * Remove default implementation in favor of pushing down exception throwing Original commit: elastic/x-pack-elasticsearch@11d3d69eb1