support stored system procedures (#171)

statement.go

@@ -82,7 +82,7 @@ type QueryStats struct {
 
 var (
 	// SQL
-	selectRe = regexp.MustCompile(`(?is)^(?:WITH|@{.+|SELECT)\s.+$`)
+	selectRe = regexp.MustCompile(`(?is)^(?:WITH|CALL|@{.+|SELECT)\s.+$`)
 
 	// DDL
 	createDatabaseRe = regexp.MustCompile(`(?is)^CREATE\s+DATABASE\s.+$`)

statement_test.go

@@ -507,6 +507,21 @@ func TestBuildStatement(t *testing.T) {
 			input: "DESC SELECT * FROM t1",
 			want:  &ExplainStatement{Explain: "SELECT * FROM t1"},
 		},
+		{
+			desc:  "Stored system procedures",
+			input: `CALL cancel_query("1234567890123456789")`,
+			want:  &SelectStatement{Query: `CALL cancel_query("1234567890123456789")`},
+		},
+		{
+			desc:  "EXPLAIN Stored system procedures",
+			input: `EXPLAIN CALL cancel_query("1234567890123456789")`,
+			want:  &ExplainStatement{Explain: `CALL cancel_query("1234567890123456789")`},
+		},
+		{
+			desc:  "EXPLAIN ANALYZE Stored system procedures",
+			input: `EXPLAIN ANALYZE CALL cancel_query("1234567890123456789")`,
+			want:  &ExplainAnalyzeStatement{Query: `CALL cancel_query("1234567890123456789")`},
+		},
 	} {
 		t.Run(test.desc, func(t *testing.T) {
 			got, err := BuildStatement(test.input)