sql: make current_role an alias for current_user

Release note (sql change): `current_role` is recognized as an alias for `current_user` for better compatibility with PostgreSQL.
cockroachdb · Feb 20, 2018 · 2f22fca · 2f22fca
1 parent e4930b7
commit 2f22fca
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diff --git a/docs/generated/sql/bnf/stmt_block.bnf b/docs/generated/sql/bnf/stmt_block.bnf
@@ -1769,6 +1769,7 @@ func_expr_common_subexpr ::=
 	| 'CURRENT_CATALOG'
 	| 'CURRENT_TIMESTAMP'
 	| 'CURRENT_USER'
+	| 'CURRENT_ROLE'
 	| 'SESSION_USER'
 	| 'USER'
 	| 'CAST' '(' a_expr 'AS' cast_target ')'

diff --git a/pkg/sql/parser/parse_test.go b/pkg/sql/parser/parse_test.go
@@ -1068,6 +1068,8 @@ func TestParse2(t *testing.T) {
 			`SELECT btrim(a, b)`},
 		{`SELECT CURRENT_USER`,
 			`SELECT current_user()`},
+		{`SELECT CURRENT_ROLE`,
+			`SELECT current_user()`},
 		{`SELECT SESSION_USER`,
 			`SELECT current_user()`},
 		{`SELECT USER`,

diff --git a/pkg/sql/parser/sql.y b/pkg/sql/parser/sql.y
@@ -6366,11 +6366,16 @@ func_expr_common_subexpr:
   {
     $$.val = &tree.FuncExpr{Func: tree.WrapFunction($1)}
   }
-| CURRENT_ROLE { return unimplemented(sqllex, "current role") }
 | CURRENT_USER
   {
     $$.val = &tree.FuncExpr{Func: tree.WrapFunction($1)}
   }
+// Special identifier current_role is equivalent to current_user.
+// https://www.postgresql.org/docs/10/static/functions-info.html
+| CURRENT_ROLE
+  {
+    $$.val = &tree.FuncExpr{Func: tree.WrapFunction("current_user")}
+  }
 | SESSION_USER
   {
     $$.val = &tree.FuncExpr{Func: tree.WrapFunction("current_user")}