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Moderne licensed

Find scalar subqueries in the SELECT list

Recipe IDorg.openrewrite.sql.antipattern.FindScalarSubqueryInSelect
Artifactorg.openrewrite.recipe:rewrite-sql

A subquery used as an expression in the SELECT list may execute once per result row, turning a single scan into N+1 queries. A JOIN (or LATERAL join) produces the same values in one pass. Subqueries in WHERE, FROM, or JOIN conditions are not flagged.

Single recipeProprietary

Usage

This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.

mod run . --recipe org.openrewrite.sql.antipattern.FindScalarSubqueryInSelect

If the recipe isn’t available locally, install it with:

mod config recipes jar install org.openrewrite.recipe:rewrite-sql:2.14.1

Data tables

Structured output this recipe can produce.

  • SQL anti-patternsSQL statements matching performance anti-pattern rules.org.openrewrite.sql.table.SqlAntiPatterns
  • Source files that had resultsSource files that were modified by the recipe run.org.openrewrite.table.SourcesFileResults
  • Source files that had search resultsSearch results that were found during the recipe run.org.openrewrite.table.SearchResults
  • Source files that errored on a recipeThe details of all errors produced by a recipe run.org.openrewrite.table.SourcesFileErrors
  • Recipe performanceStatistics used in analyzing the performance of recipes.org.openrewrite.table.RecipeRunStats