Add percents to ColumnStats

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/processes/implementations/columnstats/ColumnStatsStep.java

@@ -23,6 +23,8 @@ package com.kingsrook.qqq.backend.core.processes.implementations.columnstats;
 
 
 import java.io.Serializable;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -303,14 +305,18 @@ public class ColumnStatsStep implements BackendStep
          /////////////////////////////////////////////////////////////////////////////////
          // just in case any of these don't fit in an integer, use decimal for them all //
          /////////////////////////////////////////////////////////////////////////////////
+         Aggregate countTotalRowsAggregate = new Aggregate(table.getPrimaryKeyField(), AggregateOperator.COUNT).withFieldType(QFieldType.DECIMAL);
          Aggregate countNonNullAggregate   = new Aggregate(fieldName, AggregateOperator.COUNT).withFieldType(QFieldType.DECIMAL);
          Aggregate countDistinctAggregate  = new Aggregate(fieldName, AggregateOperator.COUNT_DISTINCT).withFieldType(QFieldType.DECIMAL);
          Aggregate sumAggregate            = new Aggregate(fieldName, AggregateOperator.SUM).withFieldType(QFieldType.DECIMAL);
          Aggregate avgAggregate            = new Aggregate(fieldName, AggregateOperator.AVG).withFieldType(QFieldType.DECIMAL);
          Aggregate minAggregate            = new Aggregate(fieldName, AggregateOperator.MIN);
          Aggregate maxAggregate            = new Aggregate(fieldName, AggregateOperator.MAX);
+
          AggregateInput statsAggregateInput = new AggregateInput();
+         statsAggregateInput.withAggregate(countTotalRowsAggregate);
          statsAggregateInput.withAggregate(countNonNullAggregate);
+
          if(doCountDistinct)
          {
             statsAggregateInput.withAggregate(countDistinctAggregate);
@@ -332,6 +338,7 @@ public class ColumnStatsStep implements BackendStep
             statsAggregateInput.withAggregate(maxAggregate);
          }
 
+         BigDecimal totalRows = null;
          if(CollectionUtils.nullSafeHasContents(statsAggregateInput.getAggregates()))
          {
             statsAggregateInput.setTableName(tableName);
@@ -346,6 +353,8 @@ public class ColumnStatsStep implements BackendStep
             {
                AggregateResult statsAggregateResult = statsAggregateOutput.getResults().get(0);
 
+               totalRows = ValueUtils.getValueAsBigDecimal(statsAggregateResult.getAggregateValue(countTotalRowsAggregate));
+
                statsRecord.setValue(countNonNullField.getName(), statsAggregateResult.getAggregateValue(countNonNullAggregate));
                if(doCountDistinct)
                {
@@ -388,6 +397,27 @@ public class ColumnStatsStep implements BackendStep
             }
          }
 
+         /////////////////////
+         // figure count%'s //
+         /////////////////////
+         if(totalRows == null)
+         {
+            totalRows = new BigDecimal(valueCounts.stream().mapToInt(r -> r.getValueInteger("count")).sum());
+         }
+
+         if(totalRows != null && totalRows.compareTo(BigDecimal.ZERO) > 0)
+         {
+            BigDecimal oneHundred = new BigDecimal(100);
+            for(QRecord valueCount : valueCounts)
+            {
+               BigDecimal percent = new BigDecimal(Objects.requireNonNullElse(valueCount.getValueInteger("count"), 0)).divide(totalRows, 4, RoundingMode.HALF_UP).multiply(oneHundred).setScale(2, RoundingMode.HALF_UP);
+               valueCount.setValue("percent", percent);
+            }
+
+            QFieldMetaData percentField = new QFieldMetaData("percent", QFieldType.DECIMAL).withDisplayFormat(DisplayFormat.PERCENT_POINT2).withLabel("Percent");
+            QValueFormatter.setDisplayValuesInRecords(Map.of(fieldName, field, "percent", percentField), valueCounts);
+         }
+
          QInstanceEnricher qInstanceEnricher = new QInstanceEnricher(null);
          fields.forEach(qInstanceEnricher::enrichField);
 

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/processes/implementations/columnstats/ColumnStatsStepTest.java

@@ -1,7 +1,29 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.kingsrook.qqq.backend.core.processes.implementations.columnstats;
 
 
 import java.io.Serializable;
+import java.math.BigDecimal;
 import java.util.List;
 import java.util.Map;
 import com.kingsrook.qqq.backend.core.BaseTest;
@@ -53,9 +75,20 @@ class ColumnStatsStepTest extends BaseTest
       @SuppressWarnings("unchecked")
       List<QRecord> valueCounts = (List<QRecord>) values.get("valueCounts");
 
-      assertThat(valueCounts.get(0).getValues()).hasFieldOrPropertyWithValue("lastName", "Simpson").hasFieldOrPropertyWithValue("count", 3);
+      assertThat(valueCounts.get(0).getValues())
-      assertThat(valueCounts.get(1).getValues()).hasFieldOrPropertyWithValue("lastName", null).hasFieldOrPropertyWithValue("count", 2); // here's the assert for the "" and null record above.
+         .hasFieldOrPropertyWithValue("lastName", "Simpson")
-      assertThat(valueCounts.get(2).getValues()).hasFieldOrPropertyWithValue("lastName", "Flanders").hasFieldOrPropertyWithValue("count", 1);
+         .hasFieldOrPropertyWithValue("count", 3)
+         .hasFieldOrPropertyWithValue("percent", new BigDecimal("50.00"));
+
+      assertThat(valueCounts.get(1).getValues())
+         .hasFieldOrPropertyWithValue("lastName", null)
+         .hasFieldOrPropertyWithValue("count", 2) // here's the assert for the "" and null record above.
+         .hasFieldOrPropertyWithValue("percent", new BigDecimal("33.33"));
+
+      assertThat(valueCounts.get(2).getValues())
+         .hasFieldOrPropertyWithValue("lastName", "Flanders")
+         .hasFieldOrPropertyWithValue("count", 1)
+         .hasFieldOrPropertyWithValue("percent", new BigDecimal("16.67"));
    }
 
 }