Update limit pushdown error message

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

Author: yuancu

opensearch/src/main/java/org/opensearch/sql/opensearch/planner/physical/OpenSearchLimitIndexScanRule.java

@@ -41,6 +41,7 @@ public void onMatch(RelOptRuleCall call) {
   }
 
   private static Integer extractLimitValue(RexNode fetch) {
+    // fetch is always a integer literal (specified in our PPL/SQL syntax)
     if (fetch instanceof RexLiteral) {
       return ((RexLiteral) fetch).getValueAs(Integer.class);
     }

opensearch/src/main/java/org/opensearch/sql/opensearch/storage/scan/CalciteLogicalIndexScan.java

@@ -102,7 +102,7 @@ public CalciteLogicalIndexScan pushDownFilter(Filter filter) {
       if (LOG.isDebugEnabled()) {
         LOG.debug("Cannot pushdown the filter condition {}", filter.getCondition(), e);
       } else {
-        LOG.warn("Cannot pushdown the filter condition {}, ", filter.getCondition());
+        LOG.info("Cannot pushdown the filter condition {}, ", filter.getCondition());
       }
     }
     return null;
@@ -159,7 +159,7 @@ public CalciteLogicalIndexScan pushDownAggregate(Aggregate aggregate) {
       if (LOG.isDebugEnabled()) {
         LOG.debug("Cannot pushdown the aggregate {}", aggregate, e);
       } else {
-        LOG.warn("Cannot pushdown the aggregate {}, ", aggregate);
+        LOG.info("Cannot pushdown the aggregate {}, ", aggregate);
       }
     }
     return null;
@@ -175,7 +175,11 @@ public CalciteLogicalIndexScan pushDownLimit(Integer limit, Integer offset) {
               requestBuilder -> requestBuilder.pushDownLimit(limit, offset)));
       return newScan;
     } catch (Exception e) {
-      LOG.debug("Cannot pushdown limit {} with offset {}. Exception: {}", limit, offset, e);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Cannot pushdown limit {} with offset {}", limit, offset, e);
+      } else {
+        LOG.info("Cannot pushdown limit {} with offset {}", limit, offset);
+      }
     }
     return null;
   }