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Moderne licensed

Find DISTINCT masking join fan-out

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

DISTINCT paired with a JOIN frequently compensates for row multiplication that a correct join condition or an EXISTS test would avoid, and DISTINCT alongside GROUP BY is redundant because grouping already collapses duplicate rows. A DISTINCT on a single-table query without GROUP BY is 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.FindDistinctWithJoin

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