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/options.go

@@ -0,0 +1,39 @@
+package participle
+
+import (
+	"github.com/alecthomas/participle/lexer"
+)
+
+// An Option to modify the behaviour of the Parser.
+type Option func(p *Parser) error
+
+// Lexer is an Option that sets the lexer to use with the given grammar.
+func Lexer(def lexer.Definition) Option {
+	return func(p *Parser) error {
+		p.lex = def
+		return nil
+	}
+}
+
+// UseLookahead allows branch lookahead up to "n" tokens.
+//
+// If parsing cannot be disambiguated before "n" tokens of lookahead, parsing will fail.
+//
+// Note that increasing lookahead has a minor performance impact, but also
+// reduces the accuracy of error reporting.
+func UseLookahead(n int) Option {
+	return func(p *Parser) error {
+		p.useLookahead = n
+		return nil
+	}
+}
+
+// CaseInsensitive allows the specified token types to be matched case-insensitively.
+func CaseInsensitive(tokens ...string) Option {
+	return func(p *Parser) error {
+		for _, token := range tokens {
+			p.caseInsensitive[token] = true
+		}
+		return nil
+	}
+}