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Impala already supports IF NOT EXISTS in alter table add columns for general hive table in IMPALA-7832, but not for kudu/iceberg table. This patch try to add such semantics for kudu/iceberg table. Testing: - Updated E2E DDL tests - Added fe tests Change-Id: I82590e5372e881f2e81d4ed3dd0d32a2d3ddb517 Reviewed-on: http://gerrit.cloudera.org:8080/18953 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com>