fix: BigQuery default sort order

- fixes #10

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

src/test/java/ai/starlake/transpiler/JSQLTranspilerTest.java

@@ -254,6 +254,8 @@ static synchronized void init()
         new File(EXTRACTION_PATH, JSQLTranspilerTest.class.getSimpleName() + ".duckdb");
     Properties info = new Properties();
     info.put("old_implicit_casting", "true");
+    // info.put("default_null_order", "NULLS FIRST");
+    // info.put("default_order", "ASC");
     connDuck = DriverManager.getConnection("jdbc:duckdb:" + fileDuckDB.getAbsolutePath(), info);
 
     if (!isInitialised) {
@@ -482,6 +484,11 @@ public static void executeTest(Connection connDuck, SQLTest t, String transpiled
       try (Statement st = connDuck.createStatement()) {
         st.executeUpdate("set timezone='Asia/Bangkok'");
 
+        if (t.inputDialect == JSQLTranspiler.Dialect.GOOGLE_BIG_QUERY) {
+          st.executeUpdate("set default_null_order='NULLS FIRST'");
+          st.executeUpdate("set default_order='ASC'");
+        }
+
         try (ResultSet rs = st.executeQuery(transpiledSqlStr);) {
           while (rs.next()) {
             i++;

src/test/resources/ai/starlake/transpiler/bigquery/aggregate_function.sql

@@ -119,12 +119,12 @@ FROM (select UNNEST([0, 2, NULL, 4, 4, 5]) AS x) as x;
 
 -- result
 "x","avg"
+"",""
 "0","0.0"
 "2","1.0"
 "4","3.0"
 "4","4.0"
 "5","4.5"
-"","5.0"
 
 
 -- provided
@@ -230,7 +230,7 @@ order by 1 NULLS FIRST;
 
 -- result
 "x","num_negative"
-"","1"
+"","0"
 "-10","2"
 "-7","2"
 "-2","1"
@@ -261,12 +261,12 @@ ORDER BY product_name, product_type;
 
 -- result
 "product_type","product_name","product_sum","product_type_agg","product_name_agg"
+"","","42","1","1"
+"pants","","6","0","1"
+"shirt","","36","0","1"
 "","jeans","6","1","0"
 "","polo","25","1","0"
 "","t-shirt","11","1","0"
-"pants","","6","0","1"
-"shirt","","36","0","1"
-"","","42","1","1"
 
 
 -- provided
@@ -394,11 +394,11 @@ FROM( SELECT UNNEST( ['apple',NULL,'pear','banana','pear'] )AS FRUIT ) AS FRUIT
 
 -- result
 "fruit","string_agg"
+"",""
 "pear","pear & pear"
 "pear","pear & pear"
 "apple","pear & pear & apple"
 "banana","pear & pear & apple & banana"
-"","pear & pear & apple & banana"
 
 
 -- provided