Support partial filter push down

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

@@ -8,6 +8,7 @@
 import static org.opensearch.sql.util.MatcherUtils.assertJsonEqualsIgnoreId;
 
 import java.io.IOException;
+import org.junit.Assume;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.opensearch.sql.ppl.ExplainIT;
@@ -67,4 +68,30 @@ public void supportPushDownSortMergeJoin() throws IOException {
     String expected = loadExpectedPlan("explain_merge_join_sort_push.json");
     assertJsonEqualsIgnoreId(expected, result);
   }
+
+  // Only for Calcite
+  @Test
+  public void supportPartialPushDown() throws IOException {
+    Assume.assumeTrue("This test is only for push down enabled", isPushdownEnabled());
+    // field `address` is text type without keyword subfield, so we cannot push it down.
+    String query =
+        "source=opensearch-sql_test_index_account | where (state = 'Seattle' or age < 10) and (age"
+            + " >= 1 and address = '880 Holmes Lane') | fields age, address";
+    var result = explainQueryToString(query);
+    String expected = loadFromFile("expectedOutput/calcite/explain_partial_filter_push.json");
+    assertJsonEqualsIgnoreId(expected, result);
+  }
+
+  // Only for Calcite
+  @Test
+  public void supportPartialPushDown_NoPushIfAllFailed() throws IOException {
+    Assume.assumeTrue("This test is only for push down enabled", isPushdownEnabled());
+    // field `address` is text type without keyword subfield, so we cannot push it down.
+    String query =
+        "source=opensearch-sql_test_index_account | where (address = '671 Bristol Street' or age <"
+            + " 10) and (age >= 10 or address = '880 Holmes Lane') | fields age, address";
+    var result = explainQueryToString(query);
+    String expected = loadFromFile("expectedOutput/calcite/explain_partial_filter_push2.json");
+    assertJsonEqualsIgnoreId(expected, result);
+  }
 }

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

@@ -5,6 +5,10 @@
 
 package org.opensearch.sql.calcite.remote;
 
+import static org.opensearch.sql.legacy.TestsConstants.TEST_INDEX_BEER;
+
+import java.io.IOException;
+import org.junit.Assume;
 import org.opensearch.sql.ppl.RelevanceFunctionIT;
 
 public class CalciteRelevanceFunctionIT extends RelevanceFunctionIT {
@@ -14,4 +18,17 @@ public void init() throws Exception {
     enableCalcite();
     disallowCalciteFallback();
   }
+
+  // For Calcite, this PPL won't throw exception since it supports partial pushdown and has
+  // optimization rule `FilterProjectTransposeRule` to push down the filter through the project.
+  @Override
+  public void not_pushdown_throws_exception() throws IOException {
+    Assume.assumeTrue("This test is only for push down enabled", isPushdownEnabled());
+    String query1 =
+        "SOURCE="
+            + TEST_INDEX_BEER
+            + " | EVAL answerId = AcceptedAnswerId + 1"
+            + " | WHERE simple_query_string(['Tags'], 'taste') and answerId > 200";
+    assertEquals(5, executeQuery(query1).getInt("total"));
+  }
 }

integ-test/src/test/resources/expectedOutput/calcite/explain_partial_filter_push.json

@@ -0,0 +1,6 @@
+{
+  "calcite": {
+    "logical": "LogicalProject(age=[$8], address=[$2])\n  LogicalFilter(condition=[AND(OR(=($7, 'Seattle'), <($8, 10)), >=($8, 1), =($2, '880 Holmes Lane'))])\n    CalciteLogicalIndexScan(table=[[OpenSearch, opensearch-sql_test_index_account]])\n",
+    "physical": "EnumerableCalc(expr#0..1=[{inputs}], expr#2=['880 Holmes Lane':VARCHAR], expr#3=[=($t0, $t2)], age=[$t1], address=[$t0], $condition=[$t3])\n  CalciteEnumerableIndexScan(table=[[OpenSearch, opensearch-sql_test_index_account]], PushDownContext=[[PROJECT->[address, state, age], FILTER->AND(OR(=($1, 'Seattle'), <($2, 10)), >=($2, 1)), PROJECT->[address, age]], OpenSearchRequestBuilder(sourceBuilder={\"from\":0,\"timeout\":\"1m\",\"query\":{\"bool\":{\"must\":[{\"bool\":{\"should\":[{\"term\":{\"state.keyword\":{\"value\":\"Seattle\",\"boost\":1.0}}},{\"range\":{\"age\":{\"from\":null,\"to\":10,\"include_lower\":true,\"include_upper\":false,\"boost\":1.0}}}],\"adjust_pure_negative\":true,\"boost\":1.0}},{\"range\":{\"age\":{\"from\":1,\"to\":null,\"include_lower\":true,\"include_upper\":true,\"boost\":1.0}}}],\"adjust_pure_negative\":true,\"boost\":1.0}},\"_source\":{\"includes\":[\"address\",\"age\"],\"excludes\":[]},\"sort\":[{\"_doc\":{\"order\":\"asc\"}}]}, requestedTotalSize=2147483647, pageSize=null, startFrom=0)])\n"
+  }
+}

integ-test/src/test/resources/expectedOutput/calcite/explain_partial_filter_push2.json

@@ -0,0 +1,6 @@
+{
+  "calcite": {
+    "logical": "LogicalProject(age=[$8], address=[$2])\n  LogicalFilter(condition=[AND(OR(=($2, '671 Bristol Street'), <($8, 10)), OR(>=($8, 10), =($2, '880 Holmes Lane')))])\n    CalciteLogicalIndexScan(table=[[OpenSearch, opensearch-sql_test_index_account]])\n",
+    "physical": "EnumerableCalc(expr#0..1=[{inputs}], expr#2=['671 Bristol Street':VARCHAR], expr#3=[=($t0, $t2)], expr#4=[10], expr#5=[<($t1, $t4)], expr#6=[OR($t3, $t5)], expr#7=[>=($t1, $t4)], expr#8=['880 Holmes Lane':VARCHAR], expr#9=[=($t0, $t8)], expr#10=[OR($t7, $t9)], expr#11=[AND($t6, $t10)], age=[$t1], address=[$t0], $condition=[$t11])\n  CalciteEnumerableIndexScan(table=[[OpenSearch, opensearch-sql_test_index_account]], PushDownContext=[[PROJECT->[address, age]], OpenSearchRequestBuilder(sourceBuilder={\"from\":0,\"timeout\":\"1m\",\"_source\":{\"includes\":[\"address\",\"age\"],\"excludes\":[]}}, requestedTotalSize=2147483647, pageSize=null, startFrom=0)])\n"
+  }
+}

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

@@ -7,6 +7,7 @@
 import java.util.function.Predicate;
 import org.apache.calcite.plan.RelOptRuleCall;
 import org.apache.calcite.plan.RelRule;
+import org.apache.calcite.rel.AbstractRelNode;
 import org.apache.calcite.rel.core.Filter;
 import org.apache.calcite.rel.logical.LogicalFilter;
 import org.immutables.value.Value;
@@ -37,9 +38,9 @@ public void onMatch(RelOptRuleCall call) {
   }
 
   protected void apply(RelOptRuleCall call, Filter filter, CalciteLogicalIndexScan scan) {
-    CalciteLogicalIndexScan newScan = scan.pushDownFilter(filter);
-    if (newScan != null) {
-      call.transformTo(newScan);
+    AbstractRelNode newRel = scan.pushDownFilter(filter);
+    if (newRel != null) {
+      call.transformTo(newRel);
     }
   }