feat(optimizer)!: Annotate CURRENT_CATALOG() for Hive, Spark, and DBX

Author: AbhishekASLK

sqlglot/typing/hive.py

@@ -26,4 +26,5 @@
     exp.Encode: {"returns": exp.DataType.Type.BINARY},
     exp.If: {"annotator": lambda self, e: self._annotate_by_args(e, "true", "false", promote=True)},
     exp.StrToUnix: {"returns": exp.DataType.Type.BIGINT},
+    exp.CurrentCatalog: {"returns": exp.DataType.Type.VARCHAR},
 }

tests/fixtures/optimizer/annotate_functions.sql

@@ -515,6 +515,10 @@ DOUBLE;
 CBRT(tbl.int_col);
 DOUBLE;
 
+# dialect: hive, spark2, spark, databricks
+CURRENT_CATALOG();
+STRING;
+
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 -- BigQuery
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