remove keyword : DAY、MONTH、HOUR、MINUTE、SECOND

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -208,8 +208,6 @@ public class SQLExprParser extends SQLParser {
             case REFERENCE:
             case KEY:
             case DISTINCT:
-            case YEAR:
-            case MONTH:
             case TIME:
             case ZONE:
             case LOG:

src/main/java/com/alibaba/druid/sql/parser/SQLParser.java

@@ -69,8 +69,7 @@ public class SQLParser {
                 return alias;
             }
 
-            if (lexer.token() == Token.YEAR || lexer.token() == Token.DAY || lexer.token() == Token.KEY
-                || lexer.token() == Token.CASE || lexer.token() == Token.TIMESTAMP) {
+            if (lexer.token() == Token.KEY || lexer.token() == Token.CASE || lexer.token() == Token.TIMESTAMP) {
                 alias = lexer.token.name();
                 lexer.nextToken();
                 return alias;
@@ -97,8 +96,7 @@ public class SQLParser {
         } else if (lexer.token() == Token.LITERAL_CHARS) {
             alias = "'" + lexer.stringVal() + "'";
             lexer.nextToken();
-        } else if (lexer.token() == Token.YEAR || lexer.token() == Token.DAY || lexer.token() == Token.TIME
-                   || lexer.token() == Token.MONTH || lexer.token() == Token.CASE || lexer.token() == Token.AT
+        } else if (lexer.token() == Token.TIME || lexer.token() == Token.CASE || lexer.token() == Token.AT
                    || lexer.token() == Token.TIMESTAMP || lexer.token() == Token.LOG) {
             alias = lexer.token.name();
             lexer.nextToken();

src/main/java/com/alibaba/druid/sql/parser/Token.java

@@ -142,12 +142,7 @@ public enum Token {
     EXTRACT("EXTRACT"),
     TIMESTAMP("TIMESTAMP"),
     DATE("DATE"),
-    CURSOR("SECOND"),
-    DAY("DAY"),
-    YEAR("YEAR"),
-    MONTH("MONTH"),
-    MINUTE("MINUTE"),
-    SECOND("SECOND"),
+    CURSOR("CURSOR"),
     TO("TO"),
     MODEL("MODEL"),
     MERGE("MERGE"),