Ignore testNestedAggregationsExplain when pushdown is disabled

Signed-off-by: Yuanchun Shen <yuanchu@amazon.com>

Author: yuancu

integ-test/src/test/java/org/opensearch/sql/calcite/remote/CalciteExplainIT.java

@@ -1230,8 +1230,10 @@ public void testCasePushdownAsRangeQueryExplain() throws IOException {
 
   @Test
   public void testNestedAggregationsExplain() throws IOException {
-    // the query runs into error when pushdown is disabled due to bin's implementation
-    Assume.assumeFalse(isPushdownDisabled());
+    // TODO: Remove after resolving: https://github.com/opensearch-project/sql/issues/4578
+    Assume.assumeFalse(
+        "The query runs into error when pushdown is disabled due to bin's implementation",
+        isPushdownDisabled());
     assertYamlEqualsJsonIgnoreId(
         loadExpectedPlan("agg_composite_autodate_range_metric_push.yaml"),
         explainQueryToString(

integ-test/src/test/java/org/opensearch/sql/calcite/remote/CalcitePPLCaseFunctionIT.java

@@ -18,6 +18,7 @@
 
 import java.io.IOException;
 import org.json.JSONObject;
+import org.junit.Assume;
 import org.junit.jupiter.api.Test;
 import org.opensearch.client.Request;
 import org.opensearch.sql.legacy.TestsConstants;
@@ -476,6 +477,11 @@ public void testCaseAggWithNullValues() throws IOException {
 
   @Test
   public void testNestedCaseAggWithAutoDateHistogram() throws IOException {
+    // TODO: Remove after resolving: https://github.com/opensearch-project/sql/issues/4578
+    Assume.assumeFalse(
+        "The query cannot be executed when pushdown is disabled due to implementation defects of"
+            + " the bin command",
+        isPushdownDisabled());
     JSONObject actual1 =
         executeQuery(
             String.format(