Merge pull request #4867 from kuba--/nested-substring

Support nested substring calls
vitessio · May 23, 2019 · eb2d057 · eb2d057
2 parents b23af2e + eff5f47
commit eb2d057
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diff --git a/go/vt/sqlparser/parse_test.go b/go/vt/sqlparser/parse_test.go
@@ -1844,6 +1844,15 @@ func TestSubStr(t *testing.T) {
  }, {
  input: `select substring("foo", 1, 2) from t`,
  output: `select substr('foo', 1, 2) from t`,
+ }, {
+ input: `select substr(substr("foo" from 1 for 2), 1, 2) from t`,
+ output: `select substr(substr('foo', 1, 2), 1, 2) from t`,
+ }, {
+ input: `select substr(substring("foo", 1, 2), 3, 4) from t`,
+ output: `select substr(substr('foo', 1, 2), 3, 4) from t`,
+ }, {
+ input: `select substring(substr("foo", 1), 2) from t`,
+ output: `select substr(substr('foo', 1), 2) from t`,
  }}
 
  for _, tcase := range validSQL {