SeasonPilot opened a new pull request, #702:
URL: https://github.com/apache/geaflow/pull/702
### What changes were proposed in this pull request?
Implement ISO-GQL PROPERTY_EXISTS predicate function according to Section
19.13 specification.
**Core Changes:**
- Add PropertyExists UDF class in `org.apache.geaflow.dsl.udf.table.other`
- Register PROPERTY_EXISTS function in BuildInSqlFunctionTable
- Implement three-valued logic (True/False/NULL) for graph elements
- Support vertices, edges, and rows with proper NULL handling
**Features:**
- ISO-GQL Section 19.13 compliant implementation
- Three-valued logic: NULL element → NULL, existing property → TRUE
- Multiple eval() overloads for RowVertex, RowEdge, Row, and Object
- Complete JavaDoc documentation with standard references
**Test Coverage:**
- Unit tests: PropertyExistsTest with 5 test cases
- SQL integration tests: 3 test cases covering SELECT, WHERE, and edge
scenarios
- All tests passed (5/5), Checkstyle: 0 violations
### How was this PR tested?
- [x] Tests have Added for the changes
- Unit tests: PropertyExistsTest.java (5 test methods)
- SQL tests: gql_property_exists_001/002/003.sql
- Test results: 5/5 passed, 0.729s execution time
- [x] Production environment verified
- Build: SUCCESS (geaflow-dsl-plan module)
- Checkstyle: 0 violations
- Apache RAT: All files approved (281 licenses)
- Compilation: No errors or warnings
Closes #359"
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