Function isReservedKeyword

backend/plugin/parser/tidb/completion.go:385–393

isReservedKeyword reports whether a bare-shaped name is a reserved keyword that cannot be used as an unquoted identifier. omni exposes no reserved-word predicate, so we parse-check only names that lex as a single keyword token (plain identifiers are never reserved), which keeps this cheap for ordina

(name string)

// (plain identifiers are never reserved), which keeps this cheap for ordinary
// names. A keyword is reserved iff it cannot stand as a bare table reference.
func isReservedKeyword(name string) bool {
	upper := strings.ToUpper(name)
	toks := tidbparser.Tokenize(upper)
	if len(toks) != 1 || tidbparser.TokenName(toks[0].Type) == "" {
		return false
	}
	_, err := tidbparser.Parse("SELECT 1 FROM " + upper)
	return err != nil
}

// caretInsideBacktickIdentifier reports whether the caret sits inside an open
// backtick-quoted identifier (an odd number of backticks precede it), in which