feat: ParenthesedSelect can have Alias

Signed-off-by: Andreas Reichel <andreas@manticore-projects.com>

Author: manticore-projects

build.gradle

@@ -132,6 +132,8 @@ javadoc {
         options.addBooleanOption('html5', true)
     }
     options.addBooleanOption("Xdoclint:none", true)
+    options.addStringOption('J-Xmx4g')
+    options.addStringOption('J-Xss2m')
 }
 
 jar {

src/main/java/net/sf/jsqlparser/statement/select/ParenthesedSelect.java

@@ -79,7 +79,7 @@ private static Alias getAliasFromItem(FromItem fromItem) {
             TableFunction t = (TableFunction) fromItem;
             return new Alias(t.getName(), true);
         } else {
-            return new Alias(fromItem.getAlias().getName(), true);
+            return fromItem.getAlias()!=null ? new Alias(fromItem.getAlias().getName(), true) : null;
         }
     }
 

src/test/java/net/sf/jsqlparser/statement/piped/AsPipeOperatorTest.java

@@ -0,0 +1,23 @@
+package net.sf.jsqlparser.statement.piped;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.test.TestUtils;
+import org.junit.jupiter.api.Test;
+
+class AsPipeOperatorTest {
+
+    @Test
+    void testParseAndDeparse() throws JSQLParserException {
+        String sqlStr="(\n" +
+                "  SELECT '000123' AS id, 'apples' AS item, 2 AS sales\n" +
+                "  UNION ALL\n" +
+                "  SELECT '000456' AS id, 'bananas' AS item, 5 AS sales\n" +
+                ") AS sales_table\n" +
+                "|> AGGREGATE SUM(sales) AS total_sales GROUP BY id, item\n" +
+                "|> AS t1\n" +
+                "|> JOIN (SELECT 456 AS id, 'yellow' AS color) AS t2\n" +
+                "   ON CAST(t1.id AS INT64) = t2.id\n" +
+                "|> SELECT t2.id, total_sales, color;";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
+}