ganeshashree opened a new pull request, #52826:
URL: https://github.com/apache/spark/pull/52826
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### What changes were proposed in this pull request?
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This PR enhances error reporting in the catalog layer by adding detailed,
user-friendly assertion messages for various metadata validation failures. The
changes add informative error messages to 11 bare `assert()` statements across
the catalog codebase.
**Files modified:**
- `SessionCatalog.scala`: Enhanced 5 assertions with detailed error messages
- `interface.scala`: Enhanced 2 assertions (UnresolvedCatalogRelation,
HiveTableRelation)
- `SQLFunction.scala`: Enhanced 2 assertions for function validation
- `InMemoryCatalog.scala`: Enhanced 2 assertions for table operations
- `SessionCatalogSuite.scala`: Added 6 new unit tests to verify error
messages
**Enhanced assertions include:**
- Table identifier validation (missing database names)
- SQL function body validation (missing expression/query text)
- SQL function type validation (mismatched function type and return type)
- Function plan method validation (wrong method called for function type)
- Table function return parameter validation
### Why are the changes needed?
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Currently, when metadata validation fails, assertions fail with generic
"assertion failed" messages that provide no context about:
- Which table/function has the problem
- What the actual vs expected values are
- What specific validation failed
- How to resolve the issue
This makes debugging production issues very difficult, especially for:
- Missing database names in table identifiers
- Malformed SQL function definitions
- Type mismatches in SQL functions
- Internal method call errors
The enhanced error messages provide all necessary information to quickly
identify and resolve issues.
### Does this PR introduce _any_ user-facing change?
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Yes. Users will now see detailed error messages instead of generic assertion
failures.
**Before:**
assertion failed
**After:**
assertion failed: Table identifier test_table is missing database name.
UnresolvedCatalogRelation requires a fully qualified table identifier with
database.
**Example for SQL functions:**
assertion failed: SQL function 'test_func' is missing function body.
Either exprText or queryText must be defined. Found: exprText=None,
queryText=None.
### How was this patch tested?
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Added 6 new unit tests in `SessionCatalogSuite.scala` that:
- Create scenarios that trigger each assertion
- Verify that AssertionError is thrown
- Validate the complete error message matches expected format
**Test coverage:**
- `test("UnresolvedCatalogRelation requires database in identifier")`
- `test("HiveTableRelation requires database in identifier")`
- `test("SQLFunction requires either exprText or queryText")`
- `test("SQLFunction return type must match function type")`
- `test("InMemoryCatalog.createTable requires database in identifier")`
- `test("InMemoryCatalog.alterTable requires database in identifier")`
All existing tests continue to pass.
### Was this patch authored or co-authored using generative AI tooling?
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Generated-by: Claude 3.5 Sonnet (Anthropic)
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