parser: Add convert type function

Support mysql builtin function CONVERT(expr,type) See: https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#function_convert
hand-code · Sep 6, 2015 · 05816bd · 05816bd
1 parent a919e8c
commit 05816bd
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diff --git a/parser/parser.y b/parser/parser.y
@@ -1808,6 +1808,14 @@ Function:
 			Charset: $5.(string),
 		}	
 	}
+|	"CONVERT" '(' Expression ',' CastType ')' 
+	{
+		// See: https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#function_convert
+		$$ = &expressions.FunctionCast{
+			Expr: $3.(expression.Expression), 
+			Tp: $5.(*types.FieldType),
+		}	
+	}
 |	"SUBSTRING" '(' Expression ',' Expression ')'
 	{
 		$$ = &expressions.FunctionSubstring{

diff --git a/parser/parser_test.go b/parser/parser_test.go
@@ -257,6 +257,8 @@ func (s *testParserSuite) TestParser0(c *C) {
 		{"SELECT SUBSTRING('Quadratically' FROM 5);", true},
 		{"SELECT SUBSTRING('Quadratically' FROM 5 FOR 3);", true},
 
+		{"SELECT CONVERT('111', SIGNED);", true},
+
 		// For delete statement
 		{"DELETE t1, t2 FROM t1 INNER JOIN t2 INNER JOIN t3 WHERE t1.id=t2.id AND t2.id=t3.id;", true},
 		{"DELETE FROM t1, t2 USING t1 INNER JOIN t2 INNER JOIN t3 WHERE t1.id=t2.id AND t2.id=t3.id;", true},