SQL select query for CSV/JSON (#6648)

select * , select column names have been implemented for CSV.
select * is implemented for JSON.

pkg/s3select/format/errors.go

@@ -0,0 +1,38 @@
+/*
+ * Minio Cloud Storage, (C) 2018 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 format
+
+import "errors"
+
+// ErrTruncatedInput is an error if the object is not compressed properly and an
+// error occurs during decompression.
+var ErrTruncatedInput = errors.New("Object decompression failed. Check that the object is properly compressed using the format specified in the request")
+
+// ErrCSVParsingError is an error if the CSV presents an error while being
+// parsed.
+var ErrCSVParsingError = errors.New("Encountered an Error parsing the CSV file. Check the file and try again")
+
+// ErrInvalidColumnIndex is an error if you provide a column index which is not
+// valid.
+var ErrInvalidColumnIndex = errors.New("Column index in the SQL expression is invalid")
+
+// ErrParseInvalidPathComponent is an error that occurs if there is an invalid
+// path component.
+var ErrParseInvalidPathComponent = errors.New("The SQL expression contains an invalid path component")
+
+// ErrJSONParsingError is an error if while parsing the JSON an error arises.
+var ErrJSONParsingError = errors.New("Encountered an error parsing the JSON file. Check the file and try again")