support select '' as a from order

apache · Jul 31, 2020 · f8afa6c · f8afa6c
1 parent 0a3957a
commit f8afa6c
Show file tree

Hide file tree

Showing 2 changed files with 4 additions and 0 deletions.
diff --git a/...parser-statement/src/main/java/org/apache/shardingsphere/sql/parser/sql/util/SQLUtil.java b/...parser-statement/src/main/java/org/apache/shardingsphere/sql/parser/sql/util/SQLUtil.java
@@ -95,6 +95,9 @@ public static String getExpressionWithoutOutsideParentheses(final String value)
 
     private static int getParenthesesOffset(final String value) {
         int result = 0;
+        if (Strings.isNullOrEmpty(value)) {
+            return result;
+        }
         while (Paren.PARENTHESES.getLeftParen() == value.charAt(result)) {
             result++;
         }

diff --git a/...er-statement/src/test/java/org/apache/shardingsphere/sql/parser/sql/util/SQLUtilTest.java b/...er-statement/src/test/java/org/apache/shardingsphere/sql/parser/sql/util/SQLUtilTest.java
@@ -88,5 +88,6 @@ public void assertGetExactlyExpression() {
     @Test
     public void assertGetExpressionWithoutOutsideParentheses() {
         assertThat(SQLUtil.getExpressionWithoutOutsideParentheses("((a + b*c))"), is("a + b*c"));
+        assertThat(SQLUtil.getExpressionWithoutOutsideParentheses(""), is(""));
     }
 }