Add post-processing SQL over semantic query results #601

Job	Run time
clickhouse-integration	43s
postgres-integration	37s
bigquery-integration	27s
snowflake-integration	15s
ADBC integration (bigquery)	49s
ADBC integration (clickhouse)	44s
ADBC integration (snowflake)	44s
ADBC integration (postgres)	46s
	5m 5s

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