fix: add SQLExpressions.stringAgg and ensure proper spacing for WITHI… #1258
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…N GROUP ORDER BY * Added SQLExpressions.stringAgg(...) convenience method that wraps PostgreSQL string_agg, enabling fluent use with withinGroup().orderBy(). * Updated PostgreSQLTemplates to emit the mandatory space before WITHIN GROUP so generated SQL is syntactically correct. * Added unit test StringAggWithinGroupOrderByTest to prevent regressions and document expected query output.
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📝 Pull-Request Description
What & Why
PostgreSQL’s
string_agg( … ) WITHIN GROUP (ORDER BY …)was rendered without the required space beforeWITHIN GROUP, producing invalid SQL such asThe root cause is documented in the upstream bug report
➡️ [querydsl/querydsl #3851](querydsl/querydsl#3851).
This PR ports the fix to the
openfeign/querydslfork so downstream consumers get the corrected SQL generation.Changes in this PR
querydsl-sql/src/main/java/com/querydsl/sql/dsl/SQLExpressions.javastringAgg(Expression<String>, Expression<?> separator)convenience method, mirroring other aggregate helpers and enabling fluentwithinGroup().orderBy(… )chaining.querydsl-sql/src/main/java/com/querydsl/sql/PostgreSQLTemplates.javastring_aggandWITHIN GROUP, producing valid SQL.querydsl-sql/src/test/java/.../StringAggWithinGroupOrderByTest.javastring_agg(foo.name,';') WITHIN GROUP (ORDER BY foo.id asc); fails on old code, passes after fix.Before vs. After
string_agg(foo.name,';')WITHIN GROUP(ORDER BY foo.id asc)string_agg(foo.name,';') WITHIN GROUP (ORDER BY foo.id asc)Compatibility
stringAgg) and template fix.Tests & CI
easy-jacoco-maven-pluginresolution and is unrelated to this patch. I can follow up with a workflow or version pin if desired.Related
🤝 Thanks for reviewing!