Use binary search to speed up matching keywords (#191)

tests/sqlparser_common.rs

@@ -21,6 +21,7 @@
 use matches::assert_matches;
 
 use sqlparser::ast::*;
+use sqlparser::dialect::keywords::ALL_KEYWORDS;
 use sqlparser::parser::*;
 use sqlparser::test_utils::{all_dialects, expr_from_projection, number, only};
 
@@ -2851,6 +2852,14 @@ fn parse_drop_index() {
     }
 }
 
+#[test]
+fn keywords_sorted() {
+    // assert!(ALL_KEYWORDS.is_sorted())
+    let mut copy = Vec::from(ALL_KEYWORDS);
+    copy.sort();
+    assert!(copy == ALL_KEYWORDS)
+}
+
 fn parse_sql_statements(sql: &str) -> Result<Vec<Statement>, ParserError> {
     all_dialects().parse_sql_statements(sql)
 }