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Moderne licensed

Find optional filters written as OR parameter IS NULL

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

The col = ? OR ? IS NULL pattern turns a filter on and off at runtime, so the planner must settle on one generic plan that works for every parameter combination instead of an index-driven plan for the filtered case. An IS NULL test on a column inside an OR is ordinary SQL and 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.FindOptionalParameterOr

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