diff --git a/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/schema/SemanticSqlDialect.java b/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/schema/SemanticSqlDialect.java
index ad61b6180..f92f7bb79 100644
--- a/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/schema/SemanticSqlDialect.java
+++ b/headless/core/src/main/java/com/tencent/supersonic/headless/core/parser/calcite/schema/SemanticSqlDialect.java
@@ -2,7 +2,6 @@ package com.tencent.supersonic.headless.core.parser.calcite.schema;
 
 import com.google.common.base.Preconditions;
 import org.apache.calcite.avatica.util.Casing;
-import org.apache.calcite.config.NullCollation;
 import org.apache.calcite.sql.SqlDialect;
 import org.apache.calcite.sql.SqlIntervalLiteral;
 import org.apache.calcite.sql.SqlNode;
@@ -20,7 +19,6 @@ public class SemanticSqlDialect extends SqlDialect {
             .withLiteralQuoteString("'")
             .withLiteralEscapedQuoteString("''")
             .withIdentifierQuoteString("`")
-            .withNullCollation(NullCollation.LOW)
             .withUnquotedCasing(Casing.UNCHANGED)
             .withQuotedCasing(Casing.UNCHANGED)
             .withCaseSensitive(false);