From e29ecec0c97a04fa483182bd5636c71f60bac311 Mon Sep 17 00:00:00 2001
From: jipeli <54889677+jipeli@users.noreply.github.com>
Date: Fri, 12 Jan 2024 18:14:47 +0800
Subject: [PATCH] (improvement)(headless) remove null collation config (#622)

---
 .../headless/core/parser/calcite/schema/SemanticSqlDialect.java | 2 --
 1 file changed, 2 deletions(-)

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);