Moderne licensed

Replace `= NULL` and `<> NULL` with `IS NULL` and `IS NOT NULL`

Recipe IDorg.openrewrite.sql.antipattern.ReplaceNullComparisonWithIsNullArtifactorg.openrewrite.recipe:rewrite-sql

Under three-valued logic a comparison with NULL evaluates to UNKNOWN rather than true, so col = NULL and col <> NULL match no rows. Rewrite them to the intended col IS NULL and col IS NOT NULL, changing only the compared operator so the rest of the statement is left untouched.

Single recipeProprietary

Add to your build

Get a download tokenThis recipe is Moderne licensed, so the token must belong to a Moderne customer. It replaces YOUR_DOWNLOAD_TOKEN below.

~/.gradle/gradle.properties

codeGenomeUsername=you@example.com
codeGenomeToken=YOUR_DOWNLOAD_TOKEN

build.gradle.kts

plugins {
    id("org.openrewrite.rewrite") version("latest.release")
}

rewrite {
    activeRecipe("org.openrewrite.sql.antipattern.ReplaceNullComparisonWithIsNull")
}

repositories {
    mavenCentral()
    maven {
        url = uri("https://artifacts.codegenomeproject.org/maven")
        credentials {
            username = providers.gradleProperty("codeGenomeUsername").get()
            password = providers.gradleProperty("codeGenomeToken").get()
        }
    }
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-sql:2.17.0")
}

Then run

./gradlew rewriteRun

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.ReplaceNullComparisonWithIsNull

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

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

Options

Name	Type	Description
`markSource`	`Boolean`	Whether to mark each occurrence in source, and apply the fix where the rule remediates. Defaults to `true`; set to `false` to leave source untouched and report only to the data table, as an analysis-only pipeline requires.

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