feat(optimizer)!: Annotate SOUNDEX(expr) for TSQL (#6887)

AbhishekASLK · web-flow · commit 9a0aaab62775 · 2026-01-29T20:11:50.000+02:00
diff --git a/sqlglot/typing/tsql.py b/sqlglot/typing/tsql.py
@@ -20,4 +20,5 @@
     },
     exp.CurrentTimezone: {"returns": exp.DataType.Type.NVARCHAR},
     exp.Radians: {"annotator": lambda self, e: self._annotate_by_args(e, "this")},
+    exp.Soundex: {"returns": exp.DataType.Type.VARCHAR},
 }
diff --git a/tests/fixtures/optimizer/annotate_functions.sql b/tests/fixtures/optimizer/annotate_functions.sql
@@ -5552,6 +5552,10 @@ FLOAT;
 CURRENT_TIMEZONE();
 NVARCHAR;
 
+# dialect: tsql
+SOUNDEX(tbl.str_col);
+VARCHAR;
+
 --------------------------------------
 -- MySQL
 --------------------------------------

Original file line number	Diff line number	Diff line change
`@@ -20,4 +20,5 @@`
`20`	`20`	`},`
`21`	`21`	`exp.CurrentTimezone: {"returns": exp.DataType.Type.NVARCHAR},`
`22`	`22`	`exp.Radians: {"annotator": lambda self, e: self._annotate_by_args(e, "this")},`
	`23`	`+ exp.Soundex: {"returns": exp.DataType.Type.VARCHAR},`
`23`	`24`	`}`