apache/gravitino

[Improvement] Potential null pointer exception when validating column with null default values in TableOpsUtils.java

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#8,016 opened on Aug 11, 2025

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good first issueimprovement

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Description

What would you like to be improved?

Error exists in catalogs/catalog-lakehouse-paimon/src/main/java/org/apache/gravitino/catalog/lakehouse/paimon/utils/TableOpsUtils.java

Test that shows the issue:

  @Test
  void testAddColumnWithNullDefaultValue() {
    assertTableChange(
        addColumn(
            getFieldName("col_5"), IntegerType.get(), (Expression) null),
        AddColumn.class,
        schemaChange -> {
          AddColumn addColumn = (AddColumn) schemaChange;
          assertEquals("col_5", addColumn.fieldName());
        });
  }

How should we improve?

Make the test pass

Contributor guide

Research direction
Inspect the failing test case 'testAddColumnWithNullDefaultValue' and trace the validation logic in the method that handles default values. The null pointer likely occurs when the default value is null. Ensure the code handles null gracefully.
Tech stack
java
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75