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Implemented a single-argument version of ST_ConvexHull() to align with PostGIS behavior and simplify usage across geometry types. Testing: Added new tests in test_geospatial_functions.py for ST_ConvexHull(), which previously had no test coverage, to verify correctness across supported geometry types. Change-Id: Idb17d98f5e75929ec0143aa16195a84dd6e50796 Reviewed-on: http://gerrit.cloudera.org:8080/23604 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Csaba Ringhofer <csringhofer@cloudera.com>