test: Implement test for sub IMPORT

Author: Stefan Steinhauser

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -1116,11 +1116,13 @@ Import SubImport() #SubImport: {
     List<ImportColumn> importColumns;
     ImportFromItem fromItem;
 } {
-    <K_IMPORT>
-    [ <K_INTO> importColumns = ImportColumns() { impt.setImportColumns(importColumns); } ]
+    "("
+        <K_IMPORT>
+        [ <K_INTO> importColumns = ImportColumns() { impt.setImportColumns(importColumns); } ]
 
-    <K_FROM>
-    fromItem = ImportFromItem() { impt.setFromItem(fromItem); }
+        <K_FROM>
+        fromItem = ImportFromItem() { impt.setFromItem(fromItem); }
+    ")"
 
     {
         return impt;
@@ -3234,7 +3236,7 @@ PlainSelect PlainSelect() #PlainSelect:
     selectItems=SelectItemsList()
 
     [ LOOKAHEAD(2) intoTables = IntoClause() { plainSelect.setIntoTables(intoTables); } ]
-    [ LOOKAHEAD(2) <K_FROM> (fromItem=FromItem() | fromItem=SubImport())
+    [ LOOKAHEAD(2) <K_FROM> fromItem=FromItem()
         [ LOOKAHEAD(2) lateralViews=LateralViews() ]
         [ LOOKAHEAD(2) joins=JoinsList() ]
     ]
@@ -3818,6 +3820,8 @@ FromItem FromItem() #FromItem:
         |
         fromItem=LateralSubSelect()
         |
+        LOOKAHEAD(2) fromItem=SubImport() { fromItem = new ParenthesedFromItem(fromItem); }
+        |
         LOOKAHEAD({ getAsBoolean(Feature.allowUnparenthesizedSubSelects) }) fromItem=Select()
     )
 

src/test/java/net/sf/jsqlparser/statement/select/SelectTest.java

@@ -6154,4 +6154,14 @@ public void testSelectWithSkylineKeywords() throws JSQLParserException {
                 select.getPlainSelect().getSelectItems().toString());
     }
 
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "SELECT * FROM ( IMPORT FROM EXA AT connectionName STATEMENT 'select 1' )",
+            "SELECT * FROM ( IMPORT INTO ( LIKE schemaName.tableName ( a, b as c) ) FROM EXA AT connectionName STATEMENT 'select 1' )",
+            "SELECT * FROM schemaName.tableName JOIN ( IMPORT FROM EXA AT connectionName STATEMENT 'select 1' ) USING ( columnName )"
+    })
+    public void testSelectWithSubImport(String sqlStr) throws JSQLParserException {
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr);
+    }
+
 }