From 381ec854b570b70310a801cd5052f4fb26ddd2f6 Mon Sep 17 00:00:00 2001
From: juicer <wgzhsd@gmail.com>
Date: Fri, 29 Jul 2016 18:31:41 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E5=85=B3=E4=BA=8E=20NULL=20?=
 =?UTF-8?q?=E7=9A=84=E9=97=AE=E9=A2=98?=
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Oracle 中  原始sql  ：alter table aaa modify bbb null;
转换后成为：  ALTER TABLE  aaa  MODIFY ( bbb DEFAULT NULL );
原始Sql的语义改变了，改变了字段的default值
---
 src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
index aae45f4a2b..883b0595d3 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
@@ -65,6 +65,7 @@ import com.alibaba.druid.sql.ast.expr.SQLUnaryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLUnaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
 import com.alibaba.druid.sql.ast.statement.NotNullConstraint;
+import com.alibaba.druid.sql.ast.statement.NullConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCharacterDataType;
 import com.alibaba.druid.sql.ast.statement.SQLCheck;
@@ -1688,7 +1689,7 @@ public class SQLExprParser extends SQLParser {
 
         if (lexer.token() == Token.NULL) {
             lexer.nextToken();
-            column.setDefaultExpr(new SQLNullExpr());
+            column.getConstraints().add(new NullConstraint());
             return parseColumnRest(column);
         }