fix #2224: make influxql keywords case insensitive

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## v0.9.0-rc22 [unreleased]
 
+### Bugfixes
+- [#2225](https://github.com/influxdb/influxdb/pull/2225): Make keywords completely case insensitive
+
 ### Features
 - [#2214](https://github.com/influxdb/influxdb/pull/2214): Added the option to influx CLI to execute single command and exit. Thanks @n1tr0g
 

influxql/scanner_test.go

@@ -159,6 +159,7 @@ func TestScanner_Scan(t *testing.T) {
 		{s: `WITH`, tok: influxql.WITH},
 		{s: `WRITE`, tok: influxql.WRITE},
 		{s: `explain`, tok: influxql.EXPLAIN}, // case insensitive
+		{s: `seLECT`, tok: influxql.SELECT},   // case insensitive
 	}
 
 	for i, tt := range tests {

influxql/token.go

@@ -231,11 +231,9 @@ var keywords map[string]Token
 func init() {
 	keywords = make(map[string]Token)
 	for tok := keyword_beg + 1; tok < keyword_end; tok++ {
-		keywords[strings.ToUpper(tokens[tok])] = tok
 		keywords[strings.ToLower(tokens[tok])] = tok
 	}
 	for _, tok := range []Token{AND, OR} {
-		keywords[strings.ToUpper(tokens[tok])] = tok
 		keywords[strings.ToLower(tokens[tok])] = tok
 	}
 	keywords["true"] = TRUE
@@ -280,7 +278,7 @@ func tokstr(tok Token, lit string) string {
 
 // Lookup returns the token associated with a given string.
 func Lookup(ident string) Token {
-	if tok, ok := keywords[ident]; ok {
+	if tok, ok := keywords[strings.ToLower(ident)]; ok {
 		return tok
 	}
 	return IDENT