fix: support member of syntax in mysql parser

core/src/main/java/com/alibaba/druid/sql/ast/expr/SQLBinaryOperator.java

@@ -90,6 +90,7 @@ public enum SQLBinaryOperator {
     Escape("ESCAPE", 110),
     RegExp("REGEXP", 110),
     NotRegExp("NOT REGEXP", 110),
+    MemberOf("MEMBER OF", 110),
     Equality("=", 110),
     EqEq("==", 110),
 
@@ -145,6 +146,7 @@ public boolean isRelational() {
             case NotRLike:
             case RegExp:
             case NotRegExp:
+            case MemberOf:
             case Is:
             case IsNot:
                 return true;

core/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlExprParser.java

@@ -560,6 +560,37 @@ protected void parseIndexOptions(SQLIndexDefinition indexDefinition) {
         }
     }
 
+    @Override
+    public SQLExpr relationalRest(SQLExpr expr) {
+        if (lexer.token() == Token.IDENTIFIER && lexer.hashLCase() == FnvHash.Constants.MEMBER) {
+            Lexer.SavePoint mark = lexer.mark();
+            lexer.nextToken();
+
+            if (lexer.token() == Token.OF || lexer.identifierEquals("OF")) {
+                lexer.nextToken();
+
+                SQLExpr rightExp;
+                if (lexer.token() == Token.LPAREN) {
+                    lexer.nextToken();
+                    rightExp = expr();
+                    accept(Token.RPAREN);
+                    if (rightExp instanceof SQLExprImpl) {
+                        ((SQLExprImpl) rightExp).setParenthesized(true);
+                    }
+                    rightExp = primaryRest(rightExp);
+                } else {
+                    rightExp = bitOr();
+                }
+
+                expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.MemberOf, rightExp, dbType);
+                return super.relationalRest(expr);
+            }
+            lexer.reset(mark);
+        }
+
+        return super.relationalRest(expr);
+    }
+
     @Override
     protected SQLExpr parseSelectItemRest(String ident, long hash_lower) {
         SQLExpr expr = null;

core/src/test/java/com/alibaba/druid/bvt/filter/wall/mysql/MySqlWallTest100.java

@@ -19,7 +19,8 @@
 import com.alibaba.druid.wall.spi.MySqlWallProvider;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class MySqlWallTest100 {
     @Test
@@ -31,4 +32,13 @@ public void test_false() throws Exception {
 
         assertFalse(provider.checkValid(sql));
     }
+
+    @Test
+    public void test_member_of() {
+        WallProvider provider = new MySqlWallProvider();
+
+        String sql = "select 'ab' member of('[23, \"abc\", 17, \"ab\", 10]')";
+
+        assertTrue(provider.checkValid(sql));
+    }
 }

core/src/test/java/com/alibaba/druid/bvt/sql/mysql/ComparisonFunctionsAndOperatorsTest.java

@@ -356,6 +356,18 @@ public void test_26() throws Exception {
         assertEquals("SELECT CAST(LEAST(3600, 9223372036854775808.0) AS SIGNED);", text);
     }
 
+    @Test
+    public void test_27() throws Exception {
+        String sql = "SELECT 'ab' MEMBER OF('[23, \"abc\", 17, \"ab\", 10]')";
+
+        SQLStatementParser parser = new MySqlStatementParser(sql);
+        List<SQLStatement> stmtList = parser.parseStatementList();
+
+        String text = output(stmtList);
+
+        assertEquals("SELECT 'ab' MEMBER OF '[23, \"abc\", 17, \"ab\", 10]'", text);
+    }
+
     private String output(List<SQLStatement> stmtList) {
         return SQLUtils.toSQLString(stmtList, JdbcConstants.MYSQL);
     }