rename all remaining packages to internal/ (#12418)

This is to ensure that there are no projects
that try to import `minio/minio/pkg` into
their own repo. Any such common packages should
go to `https://github.com/minio/pkg`

internal/s3select/sql/stringfuncs_contrib_test.go

@@ -0,0 +1,43 @@
+/*
+ * MinIO Object Storage (c) 2021 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sql
+
+import "testing"
+
+func TestEvalSQLSubstring(t *testing.T) {
+	evalCases := []struct {
+		s           string
+		startIdx    int
+		length      int
+		resExpected string
+		errExpected error
+	}{
+		{"abcd", 1, 1, "a", nil},
+		{"abcd", -1, 1, "a", nil},
+		{"abcd", 999, 999, "", nil},
+		{"", 999, 999, "", nil},
+		{"测试abc", 1, 1, "测", nil},
+		{"测试abc", 5, 5, "c", nil},
+	}
+
+	for i, tc := range evalCases {
+		res, err := evalSQLSubstring(tc.s, tc.startIdx, tc.length)
+		if res != tc.resExpected || err != tc.errExpected {
+			t.Errorf("Eval Case %d failed: %v %v", i, res, err)
+		}
+	}
+}