Update calcite to fix handling of queries with nested group by (#96)

* Bump linkedin-calcite version to 1.21.0.146

Motivation for version bump is fix for handling
translation for queries with nested group by.

* Add regression test for nested group by conversion

coral-hive/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'antlr'
 
 dependencies {
   antlr deps.'antlr'
-  compile('com.linkedin.calcite:calcite-core:1.21.0.140') {
+  compile('com.linkedin.calcite:calcite-core:1.21.0.146') {
     artifact {
       name = 'calcite-core'
       extension = 'jar'

coral-hive/src/test/java/com/linkedin/coral/hive/hive2rel/HiveToRelConverterTest.java

@@ -348,6 +348,15 @@ public void testUnionExtractUDF() {
     assertEquals(generated2, expected2);
   }
 
+  @Test
+  public void testNestedGroupBy() {
+    final String sql = "SELECT a, count(1) count FROM (SELECT a FROM foo GROUP BY a ) t GROUP BY a ";
+    RelNode rel = toRel(sql);
+    final String expectedSql =
+        "SELECT a, COUNT(*) count\nFROM (SELECT a, 1 $f1\nFROM hive.default.foo\nGROUP BY a) t1\nGROUP BY a";
+    assertEquals(relToHql(rel), expectedSql);
+  }
+
   private String relToString(String sql) {
     return RelOptUtil.toString(converter.convertSql(sql));
   }