[ASTERIXDB-3107][COMP] Add card/cost info for unnest_map operator

Change-Id: I69ad4760c4026663107192f2f349eceec8e49efe
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/17372
Reviewed-by: Vijay Sarathy <vijay.sarathy@couchbase.com>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
index 256551f..ecf0352 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/AccessMethodUtils.java
@@ -963,6 +963,7 @@
                     leftOuterMissingValue, context, sourceLoc);
         }
 
+        OperatorManipulationUtil.copyCardCostAnnotations(joinRef.getValue(), finalOp);
         joinRef.setValue(finalOp);
         return true;
     }
@@ -3050,6 +3051,7 @@
                 if (optFuncExpr != null) {
                     optFuncExpr.setSourceVar(funcVarIndex, ((AssignOperator) op).getVariables().get(assignVarIndex));
                 }
+
                 //add fieldName to the nested fieldName, return
                 if (nestedAccessFieldName != null) {
                     parentFieldNames.first.addAll(nestedAccessFieldName);
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
index 7c09b59..2a94359 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/am/BTreeAccessMethod.java
@@ -796,6 +796,7 @@
                     metaRecordType, dataset, context);
         }
 
+        OperatorManipulationUtil.copyCardCostAnnotations(dataSourceOp, indexSearchOp);
         return indexSearchOp;
     }
 
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java
index 20b4d82..40c25f9 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EnumerateJoinsRule.java
@@ -408,6 +408,7 @@
         if (leftInput.getOperatorTag() == LogicalOperatorTag.SELECT) {
             addCardCostAnnotations(leftInput, plan);
         }
+        addCardCostAnnotations(findDataSourceScanOperator(leftInput), plan);
     }
 
     private void buildNewTree(PlanNode plan, HashMap<EmptyTupleSourceOperator, ILogicalOperator> joinLeafInputsHashMap,
diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java
index f9f34bf..3943cf4 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/cbo/EstimatedCostComputationVisitor.java
@@ -208,7 +208,17 @@
 
     @Override
     public Pair<Double, Double> visitUnnestMapOperator(UnnestMapOperator op, Double arg) throws AlgebricksException {
-        return annotate(this, op, arg);
+        Pair<Double, Double> cardCost = new Pair<>(0.0, 0.0);
+
+        for (Map.Entry<String, Object> anno : op.getAnnotations().entrySet()) {
+            if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_OUTPUT_CARDINALITY)) {
+                cardCost.setFirst((Double) anno.getValue());
+            } else if (anno.getValue() != null && anno.getKey().equals(OperatorAnnotations.OP_COST_TOTAL)) {
+                cardCost.setSecond((Double) anno.getValue());
+            }
+        }
+
+        return cardCost;
     }
 
     @Override
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
index 3e8a95f..3457751 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/util/OperatorManipulationUtil.java
@@ -40,6 +40,7 @@
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
 import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
+import org.apache.hyracks.algebricks.core.algebra.base.OperatorAnnotations;
 import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
 import org.apache.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
 import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
@@ -522,4 +523,25 @@
             }
         }
     }
+
+    public static void copyCardCostAnnotations(ILogicalOperator sourceOp, ILogicalOperator destOp) {
+        for (Map.Entry<String, Object> anno : sourceOp.getAnnotations().entrySet()) {
+            Object annotationVal = anno.getValue();
+            if (annotationVal != null) {
+                String annotation = anno.getKey();
+                switch (annotation) {
+                    case OperatorAnnotations.OP_COST_LOCAL:
+                    case OperatorAnnotations.OP_COST_TOTAL:
+                    case OperatorAnnotations.OP_INPUT_CARDINALITY:
+                    case OperatorAnnotations.OP_OUTPUT_CARDINALITY:
+                    case OperatorAnnotations.OP_LEFT_EXCHANGE_COST:
+                    case OperatorAnnotations.OP_RIGHT_EXCHANGE_COST:
+                        destOp.getAnnotations().put(annotation, annotationVal);
+                        break;
+                    default:
+                        break;
+                }
+            }
+        }
+    }
 }