diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSource.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSource.java
index 32851d40d..e2b837c32 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSource.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisDynamicTableSource.java
@@ -99,15 +99,6 @@ public ScanRuntimeProvider getScanRuntimeProvider(ScanContext runtimeProviderCon
             String filterQuery = resolvedFilterQuery.stream().collect(Collectors.joining(" AND "));
             readOptions.setFilterQuery(filterQuery);
         }
-        if (StringUtils.isNullOrWhitespaceOnly(readOptions.getReadFields())) {
-            String[] selectFields =
-                    DataType.getFieldNames(physicalRowDataType).toArray(new String[0]);
-            readOptions.setReadFields(
-                    Arrays.stream(selectFields)
-                            .map(item -> String.format("`%s`", item.trim().replace("`", "")))
-                            .collect(Collectors.joining(", ")));
-        }
-
         if (readOptions.getUseOldApi()) {
             List<PartitionDefinition> dorisPartitions;
             try {
@@ -194,7 +185,8 @@ public Result applyFilters(List<ResolvedExpression> filters) {
         DorisExpressionVisitor expressionVisitor = new DorisExpressionVisitor();
         for (ResolvedExpression filter : filters) {
             String filterQuery = filter.accept(expressionVisitor);
-            if (!StringUtils.isNullOrWhitespaceOnly(filterQuery)) {
+            if (StringUtils.isNullOrWhitespaceOnly(readOptions.getFilterQuery())
+                    && !StringUtils.isNullOrWhitespaceOnly(filterQuery)) {
                 acceptedFilters.add(filter);
                 this.resolvedFilterQuery.add(filterQuery);
             } else {
@@ -212,5 +204,13 @@ public boolean supportsNestedProjection() {
     @Override
     public void applyProjection(int[][] projectedFields, DataType producedDataType) {
         this.physicalRowDataType = Projection.of(projectedFields).project(physicalRowDataType);
+        if (StringUtils.isNullOrWhitespaceOnly(readOptions.getReadFields())) {
+            String[] selectFields =
+                    DataType.getFieldNames(physicalRowDataType).toArray(new String[0]);
+            this.readOptions.setReadFields(
+                    Arrays.stream(selectFields)
+                            .map(item -> String.format("`%s`", item.trim().replace("`", "")))
+                            .collect(Collectors.joining(", ")));
+        }
     }
 }
diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisExpressionVisitor.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisExpressionVisitor.java
index 3f327fe2d..66242e1e1 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisExpressionVisitor.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/table/DorisExpressionVisitor.java
@@ -26,6 +26,7 @@
 import org.apache.flink.table.expressions.ValueLiteralExpression;
 import org.apache.flink.table.functions.BuiltInFunctionDefinitions;
 import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.util.StringUtils;
 
 import java.util.List;
 
@@ -66,12 +67,22 @@ public String visit(CallExpression call) {
         if (BuiltInFunctionDefinitions.IS_NOT_NULL.equals(call.getFunctionDefinition())) {
             return combineLeftExpression("IS NOT NULL", call.getResolvedChildren().get(0));
         }
+
+        if (BuiltInFunctionDefinitions.CAST.equals(call.getFunctionDefinition())) {
+            return call.getChildren().get(0).accept(this);
+        }
         return null;
     }
 
     private String combineExpression(String operator, List<ResolvedExpression> operand) {
         String left = operand.get(0).accept(this);
+        if (StringUtils.isNullOrWhitespaceOnly(left)) {
+            return null;
+        }
         String right = operand.get(1).accept(this);
+        if (StringUtils.isNullOrWhitespaceOnly(right)) {
+            return null;
+        }
         return String.format("(%s %s %s)", left, operator, right);
     }