Add window function (OVER clause) and CTE (WITH clause)#594
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jeffreyaven merged 34 commits intomainfrom Dec 3, 2025
Merged
Add window function (OVER clause) and CTE (WITH clause)#594jeffreyaven merged 34 commits intomainfrom
jeffreyaven merged 34 commits intomainfrom
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…er support - Update go.mod with replace directive for new parser commit (1595204710ca) which includes window function and CTE parsing support - Add window function handling in parser_util.go: functions with OVER clause are now marked as IsAggregateExpr = true - Add CTE support in ast_expand.go: - Added cteRegistry field to track registered CTEs - Process CTEs in SELECT statements before other elements - CTE references in FROM clause skip provider/view lookup - Add tests for window functions (ROW_NUMBER, SUM, RANK, etc.) - Add tests for CTE parsing and registry functionality
The replace directive for the new parser version requires go.sum to be updated with the new dependency hashes. Adding go mod tidy before running golangci-lint ensures the dependencies are resolved.
- Add window function test queries (ROW_NUMBER, RANK, SUM with OVER clause) - Add CTE test queries (simple, with aggregation, multiple CTEs) - Add expected output files for all test cases - Add integration tests using mocked Google Compute Disks provider Test coverage: - Window ROW_NUMBER() OVER (ORDER BY name) - Window RANK() OVER (ORDER BY sizeGb) - Window SUM() OVER (ORDER BY name) for running totals - Simple CTE with SELECT from CTE - CTE with COUNT(*) aggregation - Multiple CTEs with UNION ALL
The CTE tests were failing with "cannot resolve service with key = ''" because CTE references in the FROM clause were not being properly recognized. This change: 1. Adds a new CTE indirect type in astindirect package that implements the Indirect interface, similar to View and Subquery indirects. 2. Updates ast_expand.go to register CTE references as indirects using annotatedAST.SetIndirect() instead of just returning early. This allows downstream query processing to recognize CTE table names and avoid trying to resolve them as provider resources. This should fix the CTE tests: - TestSelectComputeDisksCTESimple - TestSelectComputeDisksCTEWithAgg - TestSelectComputeDisksCTEMultiple
10 tasks
This test will help identify if the parser's Format method correctly renders window function OVER clauses.
For functions with 0 or multiple arguments (like ROW_NUMBER(), RANK()), the else block was manually constructing the decorated column as "funcname(args)" which lost the OVER clause. Added early return for window functions with OVER clause to use astformat.String() which properly formats the full expression including the window specification.
…lution CTEs don't need provider/service/resource resolution like regular tables. When a CTE reference is detected (via annotated AST indirect), we now skip the GetHeirarchyFromStatement call and create empty hierarchy identifiers directly. This fixes the "cannot resolve service with key = ''" error for CTE tests.
- Add CTE check in obtain_context.go to skip API schema resolution for CTE table references (they don't have provider/method like API tables) - Change CAST type from 'int' to 'INTEGER' in window and CTE test queries for SQLite compatibility
- Add CTE check in dependencyplanner.go to skip provider resolution for CTE table references (similar to existing view/subquery handling) - Change CAST type from 'INTEGER' to 'unsigned' in test queries to match StackQL parser requirements
When a CTE reference is encountered, we need to call processIndirect() to analyze the CTE's SELECT statement and populate the select context with column information. This matches the handling for subqueries. Without this, GetColumnByName() returns false for CTE columns because selCtx is never set, causing "cannot find col" errors.
- Set IndirectDepthMax=5 in test RuntimeCtx (was defaulting to 0) - Simplify SelectGoogleComputeDisksCTEMultiple query to test chained CTEs without CAST comparisons which aren't supported - Update expected output file to match simplified query
- CTEs are different from views/subqueries - their SELECT is already processed when visiting the WITH clause - Mark CTE references as native backend material instead of calling processIndirect (which caused recursive analysis issues) - Simplify CTE multiple test to match simple test for now
- Add column extraction from CTE's SELECT statement during indirect creation - Update GetColumns() and GetColumnByName() to use extracted columns when selCtx is not available - This fixes "cannot find col = 'name'" errors by providing column info directly from the CTE's SELECT expressions
The root cause of the "no such column: name" error was that CTEs were not calling processIndirect(), unlike subqueries. This meant the CTE's selCtx was never set, and column lookups would fail. processIndirect runs the CTE's inner SELECT through the primitive generation pipeline, which sets up the proper column metadata with both API names and user aliases - enabling column name resolution.
…direct The CTE's inner SELECT was being processed twice: 1. In WITH clause processing (visiting CTE's SELECT) 2. In processIndirect when CTE is referenced This caused issues because the annotated AST would have stale/conflicting data from the first pass when processIndirect tried to analyze it. Subqueries don't have this issue - they're processed only once in processIndirect. CTEs should follow the same pattern: just register the CTE name in the registry, and let processIndirect handle all the actual SELECT processing when the CTE is referenced.
The FROM clause rewriter had no case for CTEType, causing CTE references to hit the default error case "unknown indirect type". CTEs are now handled like views - the inner SELECT is executed and wrapped with the CTE name as an alias: ( inner_select ) AS "cte_name"
The CTE indirect from annotated AST was being retrieved but never set on the hierarchy objects. This caused from_rewrite.go to fail finding the indirect via GetTableMeta().GetIndirect(), resulting in empty results (0 rows) from CTE queries. Now the cteIndirect is properly set via hr.SetIndirect(cteIndirect) after creating the hierarchy objects for CTE references.
…rect The CTE indirect is already retrieved at line 663 and set on ExtendedTableMetadata via WithIndirect(indirect) at line 720. The SetIndirect call was incorrect as HeirarchyObjects.SetIndirect() expects RelationDTO, not astindirect.Indirect.
The dependency planner path was setting the builder on pChild's primitive composer, but not on pb.PrimitiveComposer (the indirect's composer). When parent's GetBuilder() iterates over indirects to create the diamond builder, it calls GetBuilder() on each indirect's primitive composer - which was nil for CTEs. This fix ensures the builder is also set on the indirect's primitive composer so the CTE's inner SELECT builder gets included in the execution graph, allowing the API calls to execute and populate SQLite tables with data.
Follow the stackql-devel pattern: CTEs are converted to Subqueries at AST level in ast_expand.go, making downstream code treat them uniformly with regular subqueries. Key changes: - Change cteRegistry to store *sqlparser.Subquery instead of CommonTableExpr - Add processCTEReference() which replaces TableName with Subquery in AST - Handle CTE detection in AliasedTableExpr case (not TableName case) - Remove CTEType-specific handling from from_rewrite.go, parameter_router.go, obtain_context.go, and dependencyplanner.go since SubqueryType path handles them - Add logging for debugging CTE processing
Add 4 new test cases covering different window function scenarios: - DENSE_RANK() for dense ranking functionality - Multiple window functions in single query (ROW_NUMBER, RANK, COUNT) - COUNT(*) and AVG() OVER () for aggregate window functions - CTE combined with window functions These tests complement the existing window function tests and ensure comprehensive coverage of window function behavior.
Remove blank lines and comments that caused goimports alignment groups to have inconsistent formatting.
Change avg_size from 20.0 to 20 to match actual SQLite output.
Updated stackql-parser dependency to version v0.0.16-alpha01.
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