bug fixed sql parser for db2. for issue #2332

src/main/java/com/alibaba/druid/sql/dialect/db2/parser/DB2ExprParser.java

@@ -23,6 +23,7 @@ import com.alibaba.druid.sql.parser.SQLExprParser;
 import com.alibaba.druid.sql.parser.SQLParserFeature;
 import com.alibaba.druid.sql.parser.Token;
 import com.alibaba.druid.util.FnvHash;
+import com.alibaba.druid.util.JdbcConstants;
 
 import java.util.Arrays;
 
@@ -46,6 +47,7 @@ public class DB2ExprParser extends SQLExprParser {
     public DB2ExprParser(String sql){
         this(new DB2Lexer(sql));
         this.lexer.nextToken();
+        this.dbType = JdbcConstants.DB2;
     }
 
     public DB2ExprParser(String sql, SQLParserFeature... features){
@@ -57,6 +59,7 @@ public class DB2ExprParser extends SQLExprParser {
         super(lexer);
         this.aggregateFunctions = AGGREGATE_FUNCTIONS;
         this.aggregateFunctionHashCodes = AGGREGATE_FUNCTIONS_CODES;
+        this.dbType = JdbcConstants.DB2;
     }
 
     public SQLExpr primaryRest(SQLExpr expr) {
@@ -116,6 +119,15 @@ public class DB2ExprParser extends SQLExprParser {
                     expr = new SQLIdentifierExpr("CURRENT SCHEMA");
                 }
             }
+        } else if (lexer.identifierEquals(FnvHash.Constants.PATH)) {
+            if (expr instanceof SQLIdentifierExpr) {
+                SQLIdentifierExpr identExpr = (SQLIdentifierExpr) expr;
+                if (identExpr.hashCode64() == FnvHash.Constants.CURRENT) {
+                    lexer.nextToken();
+
+                    expr = new SQLIdentifierExpr("CURRENT PATH");
+                }
+            }
         } else if (lexer.identifierEquals(FnvHash.Constants.MONTHS)) {
             SQLIntervalExpr intervalExpr = new SQLIntervalExpr(expr, SQLIntervalUnit.MONTH);
             lexer.nextToken();

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

@@ -3679,7 +3679,7 @@ public class MySqlStatementParser extends SQLStatementParser {
                     renameStmt.addItem(item);
 
                     return renameStmt;
-                }
+                }   
             } else if (lexer.token() == Token.ORDER) {
                 throw new ParserException("TODO " + lexer.info());
             } else if (lexer.identifierEquals("CONVERT")) {

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

@@ -2789,7 +2789,13 @@ public class SQLExprParser extends SQLParser {
             item.setValue(new SQLIdentifierExpr("ON"));
             return item;
         } else {
-            accept(Token.EQ);
+            if (lexer.token == Token.EQ) {
+                lexer.nextToken();
+            } else if (JdbcConstants.DB2.equals(dbType)) {
+                // skip
+            } else {
+                accept(Token.EQ);
+            }
         }
 
         if (lexer.token == Token.ON) {

src/main/java/com/alibaba/druid/util/FnvHash.java

@@ -634,5 +634,6 @@ public final class FnvHash {
         long TBLPROPERTIES = fnv1a_64_lower("TBLPROPERTIES");
         long FULLTEXT = fnv1a_64_lower("FULLTEXT");
         long NO = fnv1a_64_lower("NO");
+        long PATH = fnv1a_64_lower("PATH");
     }
 }