Add new SQL parser to support S3 Select syntax (#7102)

- New parser written from scratch, allows easier and complete parsing
  of the full S3 Select SQL syntax. Parser definition is directly
  provided by the AST defined for the SQL grammar.

- Bring support to parse and interpret SQL involving JSON path
  expressions; evaluation of JSON path expressions will be
  subsequently added.

- Bring automatic type inference and conversion for untyped
  values (e.g. CSV data).

vendor/github.com/alecthomas/participle/lexer/errors.go

@@ -0,0 +1,26 @@
+package lexer
+
+import "fmt"
+
+// Error represents an error while parsing.
+type Error struct {
+	Message string
+	Pos     Position
+}
+
+// Errorf creats a new Error at the given position.
+func Errorf(pos Position, format string, args ...interface{}) *Error {
+	return &Error{
+		Message: fmt.Sprintf(format, args...),
+		Pos:     pos,
+	}
+}
+
+// Error complies with the error interface and reports the position of an error.
+func (e *Error) Error() string {
+	filename := e.Pos.Filename
+	if filename == "" {
+		filename = "<source>"
+	}
+	return fmt.Sprintf("%s:%d:%d: %s", filename, e.Pos.Line, e.Pos.Column, e.Message)
+}