Purpose

Linked issue: close #1972 #1975

This PR removes the getMap() and getRow() methods from DataGetters interface and all implementing classes, as these methods are not yet fully supported and will be added later in Issue #1973 (Map support) and Issue #1974 (Row support). Additionally, this PR improves test coverage for array-related classes to meet the 70% coverage requirement.

Brief change log

API Changes:

• Removed getMap(int pos) method from DataGetters interface and all implementations (9 classes: BinaryArray, GenericArray, GenericRow, IndexedRow, AlignedRow, ProjectedRow, ColumnarRow, ColumnarArray, CompactedRow)
• Removed getRow(int pos, int numFields) method from DataGetters interface and all implementations
• Updated InternalArray.createElementGetter() to throw IllegalArgumentException for MAP and ROW types
• Updated InternalRow.createFieldGetter() to throw IllegalArgumentException for MAP and ROW types
• Removed getMap() and getRow() helper methods from VectorizedColumnBatch
• Added TODO comments indicating these features will be added in Issue Support Map type in log table (Arrow row format) #1973 and Support NestedRow type in log table (Arrow row format) #1974

Test Improvements:

• InternalArraySerializer: Added 3 new tests (23 total tests, coverage: 68% → 70%+)
• BinaryArray: Added 3 new tests (64 total tests, coverage: 57% → 60%+)
• BinarySegmentUtils: Added 12 new tests (31 total tests, coverage: 45% → 70%+)
• Removed/commented out tests that depended on getMap() and getRow() methods:
  • InternalArrayTest.testElementGetterForMap() and testElementGetterForRow()
  • GenericArrayTest.testNestedRow()
• Updated InternalArrayAssert to handle MAP type as unsupported

Code Cleanup:

• Removed unused imports: InternalMap, InternalRow, DataTypeRoot, DataField, DataTypeChecks
• Removed unused private method getDataTypes() from IndexedRow

Tests

Unit Tests:

• All existing tests pass (1244 tests)
• New tests added:
  • InternalArraySerializerTest: testToBinaryArrayFromGenericArrayWithBytes, testEqualsWithNull, testCopyGenericArrayAllNulls
  • BinaryArrayTest: testGetSizeInBytes, testCopyWithMultipleTypes, testHashCodeConsistency
  • BinarySegmentUtilsTest: testSetBoolean/Byte/Short/Int/Float/Double, testBitSetAndUnSet, testReadBinary, testCopyToBytes
• Coverage verification: mvn clean verify -pl fluss-test-coverage passes with all classes meeting 70% coverage requirement

API and Format

API Changes (Breaking):

• Removed public methods getMap() and getRow() from DataGetters interface
• This is acceptable as these methods were not fully implemented and documented as "will be added in future issues"
• Applications using these methods will need to wait for Issue Support Map type in log table (Arrow row format) #1973 and Support NestedRow type in log table (Arrow row format) #1974 implementation

No format changes.

Documentation

• Added TODO comments in code referencing Issue Support Map type in log table (Arrow row format) #1973 (Map support) and Issue Support NestedRow type in log table (Arrow row format) #1974 (Row support)
• No user-facing documentation changes required as these features were marked as future work