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https://issues.apache.org/jira/browse/CALCITE-7439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruno Volpato updated CALCITE-7439:
-----------------------------------
Component/s: core
> RelToSqlConverter emits ambiguous GROUP BY after LEFT JOIN USING with
> semi-join rewrite
> ---------------------------------------------------------------------------------------
>
> Key: CALCITE-7439
> URL: https://issues.apache.org/jira/browse/CALCITE-7439
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.41.0
> Reporter: Bruno Volpato
> Priority: Minor
>
> Reproduction query
> {code:sql}
> WITH product_keys AS (
> SELECT p."product_id",
> (SELECT MAX(p3."product_id")
> FROM "foodmart"."product" p3
> WHERE p3."product_id" = p."product_id") AS "mx"
> FROM "foodmart"."product" p
> )
> SELECT DISTINCT pk."product_id"
> FROM product_keys pk
> LEFT JOIN "foodmart"."product" p2 USING ("product_id")
> WHERE pk."product_id" IN (
> SELECT p4."product_id"
> FROM "foodmart"."product" p4
> )
> {code}
> Optimizer rules
> {code}
> CoreRules.PROJECT_SUB_QUERY_TO_CORRELATE
> CoreRules.FILTER_SUB_QUERY_TO_CORRELATE
> CoreRules.JOIN_SUB_QUERY_TO_CORRELATE
> CoreRules.PROJECT_SUB_QUERY_TO_MARK_CORRELATE
> CoreRules.FILTER_SUB_QUERY_TO_MARK_CORRELATE
> CoreRules.MARK_TO_SEMI_OR_ANTI_JOIN_RULE
> CoreRules.PROJECT_TO_SEMI_JOIN
> {code}
> Generated SQL
> {code:sql}
> SELECT "product_id"
> FROM (SELECT "$cor0"."product_id", "t1"."EXPR$0" AS "mx"
> FROM "foodmart"."product" AS "$cor0",
> LATERAL (SELECT MAX("product_id") AS "EXPR$0"
> FROM "foodmart"."product"
> WHERE "product_id" = "$cor0"."product_id") AS "t1") AS "t2"
> LEFT JOIN "foodmart"."product" AS "product1" ON "t2"."product_id" =
> "product1"."product_id"
> WHERE EXISTS (SELECT 1
> FROM (SELECT "product_id"
> FROM "foodmart"."product") AS "t3"
> WHERE "t2"."product_id" = "t3"."product_id")
> GROUP BY "product_id"
> {code}
> Actual behavior
> Validation fails with:
> {code}
> org.apache.calcite.runtime.CalciteContextException:
> From line 12, column 10 to line 12, column 21: Column 'product_id' is
> ambiguous
> {code}
> Expected behavior
> The generated SQL should qualify GROUP BY with the left-side alias (for
> example, GROUP BY "t2"."product_id"), or otherwise emit SQL that is
> unambiguous and valid under PostgreSQL dialect.
> Environment
> - Calcite main branch (1.42.0-SNAPSHOT)
> - RelToSqlConverterTest with PostgreSQL dialect
> - Java 21
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