Support CTEs in sub-query reducer #1504
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Previously, "parent nodes" was used for either nodes in the FROM clause or the JOIN clause. With the addition of CTEs that are also considered parent nodes, this renames a few variables / updates some conditionals for clarity.
plypaul
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plypaul
changed the title
courtneyholcomb
approved these changes
Nov 6, 2024
| @@ -196,7 +199,7 @@ def _is_simple_source(node: SqlSelectStatementNode) -> bool: | |||
| if select_column.expr.lineage.contains_aggregate_exprs: | |||
| return False | |||
| return ( | |||
| len(node.parent_nodes) <= 1 | |||
| len(node.join_descs) == 0 | |||
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This looks like a behavior change - were there changes to the snapshots from this change alone?
| @@ -612,10 +615,11 @@ def visit_select_statement_node(self, node: SqlSelectStatementNode) -> SqlQueryP | |||
| # JOIN dim_listings c | |||
| # ON a.listing_id = b.listing_id | |||
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| assert len(node_with_reduced_parents.parent_nodes) == 1 | |||
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Was there a reason to remove this assertion?
| @@ -579,6 +578,13 @@ def _rewrite_node_with_join(node: SqlSelectStatementNode) -> SqlSelectStatementN | |||
| select_columns=tuple(clauses_to_rewrite.select_columns), | |||
| from_source=from_source, | |||
| from_source_alias=from_source_alias, | |||
| cte_sources=tuple( | |||
| SqlCteNode.create( | |||
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Should this use cte_source.with_new_select?
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This updates the sub-query reducer to support CTEs. The
SELECTstatement in each CTE is treated like aSELECT, and all CTEs are retained. i.e. a CTE is not reduced with another CTE. The CTEs are retained to make mapping to dataflow plan nodes easier in later PRs.