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* Fixes #2182: added apoc.agg.rollup procedure * updated extended.txt
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docs/asciidoc/modules/ROOT/pages/overview/apoc.agg/apoc.agg.rollup.adoc
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docs/asciidoc/modules/ROOT/partials/usage/config/apoc.agg.rollup.adoc
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| The procedure support the following properties in the APOC configuration file (`apoc.conf`): | ||
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| .Config parameters | ||
| [opts=header, cols="1,1,1,3"] | ||
| |=== | ||
| | name | type | default | description | ||
| | cube | boolean | false| to emulate the https://docs.oracle.com/cd/F49540_01/DOC/server.815/a68003/rollup_c.htm#32311[CUBE] clause, | ||
| instead of the https://docs.oracle.com/cd/F49540_01/DOC/server.815/a68003/rollup_c.htm#32084[ROLLUP] one. | ||
| |=== |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package apoc.agg; | ||
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| import java.util.Map; | ||
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| public class AggregationUtil { | ||
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| public static void updateAggregationValues(Map<String, Number> partialResult, Object property, String countKey, String sumKey, String avgKey) { | ||
| Number count = updateCountValue(partialResult, countKey); | ||
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| updateSumAndAvgValues(partialResult, property, count.doubleValue(), sumKey, avgKey); | ||
| } | ||
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| private static Number updateCountValue(Map<String, Number> partialResult, String countKey) { | ||
| Number count = partialResult.compute(countKey, | ||
| ((subKey, subVal) -> { | ||
| return subVal == null ? 1 : subVal.longValue() + 1; | ||
| })); | ||
| return count; | ||
| } | ||
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| private static void updateSumAndAvgValues(Map<String, Number> partialResult, Object property, double count, String sumKey, String avgKey) { | ||
| if (!(property instanceof Number)) { | ||
| return; | ||
| } | ||
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| Number numberProp = (Number) property; | ||
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| Number sum = partialResult.compute(sumKey, | ||
| ((subKey, subVal) -> { | ||
| if (subVal == null) { | ||
| if (numberProp instanceof Long longProp) { | ||
| return longProp; | ||
| } | ||
| return numberProp.doubleValue(); | ||
| } | ||
| if (subVal instanceof Long long1 | ||
| && numberProp instanceof Long long2) { | ||
| return long1 + long2; | ||
| } | ||
| return subVal.doubleValue() + numberProp.doubleValue(); | ||
| })); | ||
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| partialResult.compute(avgKey, ((subKey, subVal) -> { | ||
| if (subVal == null) { | ||
| return numberProp.doubleValue(); | ||
| } | ||
| return sum.doubleValue() / count; | ||
| }) | ||
| ); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package apoc.agg; | ||
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| import apoc.Extended; | ||
| import apoc.util.Util; | ||
| import org.apache.commons.collections4.ListUtils; | ||
| import org.neo4j.graphdb.Entity; | ||
| import org.neo4j.procedure.Description; | ||
| import org.neo4j.procedure.Name; | ||
| import org.neo4j.procedure.UserAggregationFunction; | ||
| import org.neo4j.procedure.UserAggregationResult; | ||
| import org.neo4j.procedure.UserAggregationUpdate; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import static apoc.agg.AggregationUtil.updateAggregationValues; | ||
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| @Extended | ||
| public class Rollup { | ||
| public static final String NULL_ROLLUP = "[NULL]"; | ||
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| @UserAggregationFunction("apoc.agg.rollup") | ||
| @Description("apoc.agg.rollup(<ANY>, [groupKeys], [aggKeys])" + | ||
| "\n Emulate an Oracle/Mysql rollup command: `ROLLUP groupKeys, SUM(aggKey1), AVG(aggKey1), COUNT(aggKey1), SUM(aggKey2), AVG(aggKey2), ... `") | ||
| public RollupFunction rollup() { | ||
| return new RollupFunction(); | ||
| } | ||
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| public static class RollupFunction { | ||
| // Function to generate all combinations of a list with "TEST" as a placeholder | ||
| public static <T> List<List<T>> generateCombinationsWithPlaceholder(List<T> elements) { | ||
| List<List<T>> result = new ArrayList<>(); | ||
| generateCombinationsWithPlaceholder(elements, 0, new ArrayList<>(), result); | ||
| return result; | ||
| } | ||
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| // Helper function for generating combinations recursively | ||
| private static <T> void generateCombinationsWithPlaceholder(List<T> elements, int index, List<T> current, List<List<T>> result) { | ||
| if (index == elements.size()) { | ||
| result.add(new ArrayList<>(current)); | ||
| return; | ||
| } | ||
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| current.add(elements.get(index)); | ||
| generateCombinationsWithPlaceholder(elements, index + 1, current, result); | ||
| current.remove(current.size() - 1); | ||
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| // Add "NULL" as a combination placeholder | ||
| current.add((T) NULL_ROLLUP); | ||
| generateCombinationsWithPlaceholder(elements, index + 1, current, result); | ||
| current.remove(current.size() - 1); | ||
| } | ||
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| private final Map<String, Object> result = new HashMap<>(); | ||
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| private final Map<List<Object>, Map<String, Number>> rolledUpData = new HashMap<>(); | ||
| private List<String> groupKeysRes = null; | ||
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| @UserAggregationUpdate | ||
| public void aggregate( | ||
| @Name("value") Object value, | ||
| @Name(value = "groupKeys") List<String> groupKeys, | ||
| @Name(value = "aggKeys") List<String> aggKeys, | ||
| @Name(value = "config", defaultValue = "{}") Map<String, Object> config) { | ||
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| boolean cube = Util.toBoolean(config.get("cube")); | ||
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| Entity entity = (Entity) value; | ||
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| if (groupKeys.isEmpty()) { | ||
| return; | ||
| } | ||
| groupKeysRes = groupKeys; | ||
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| /* | ||
| if true: | ||
| emulate the CUBE command: https://docs.oracle.com/cd/F49540_01/DOC/server.815/a68003/rollup_c.htm#32311 | ||
| else: | ||
| emulate the ROLLUP command: https://docs.oracle.com/cd/F49540_01/DOC/server.815/a68003/rollup_c.htm#32084 | ||
| */ | ||
| if (cube) { | ||
| List<List<String>> groupingSets = generateCombinationsWithPlaceholder(groupKeys); | ||
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| for (List<String> groupKey : groupingSets) { | ||
| List<Object> partialKey = new ArrayList<>(); | ||
| for (String column : groupKey) { | ||
| partialKey.add(((Entity) value).getProperty(column, NULL_ROLLUP)); | ||
| } | ||
| if (!rolledUpData.containsKey(partialKey)) { | ||
| rolledUpData.put(partialKey, new HashMap<>()); | ||
| } | ||
| rollupAggregationProperties(aggKeys, entity, partialKey); | ||
| } | ||
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| return; | ||
| } | ||
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| List<Object> groupKey = groupKeys.stream() | ||
| .map(i -> entity.getProperty(i, null)) | ||
| .toList(); | ||
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| for (int i = 0; i <= groupKey.size(); i++) { | ||
| // add NULL_ROLLUP to remaining elements, | ||
| // e.g. `[<firstGroupKey>, `NULL_ROLLUP`, `NULL_ROLLUP`]` | ||
| List<Object> partialKey = ListUtils.union(groupKey.subList(0, i), Collections.nCopies(groupKey.size() - i, NULL_ROLLUP)); | ||
| if (!rolledUpData.containsKey(partialKey)) { | ||
| rolledUpData.put(partialKey, new HashMap<>()); | ||
| } | ||
| rollupAggregationProperties(aggKeys, entity, partialKey); | ||
| } | ||
| } | ||
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| private void rollupAggregationProperties(List<String> aggKeys, Entity entity, List<Object> partialKey) { | ||
| Map<String, Number> partialResult = rolledUpData.get(partialKey); | ||
| for(var aggKey: aggKeys) { | ||
| if (!entity.hasProperty(aggKey)) { | ||
| continue; | ||
| } | ||
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| Object property = entity.getProperty(aggKey); | ||
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| String countKey = "COUNT(%s)".formatted(aggKey); | ||
| String sumKey = "SUM(%s)".formatted(aggKey); | ||
| String avgKey = "AVG(%s)".formatted(aggKey); | ||
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| updateAggregationValues(partialResult, property, countKey, sumKey, avgKey); | ||
| } | ||
| } | ||
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| /** | ||
| * Transform a Map.of(ListGroupKeys, MapOfAggResults) in a List of Map.of(AggResult + ListGroupKeyToMap) | ||
| */ | ||
| @UserAggregationResult | ||
| public Object result() { | ||
| List<HashMap<String, Object>> list = rolledUpData.entrySet().stream() | ||
| .map(e -> { | ||
| HashMap<String, Object> map = new HashMap<>(); | ||
| for (int i = 0; i < groupKeysRes.size(); i++) { | ||
| map.put(groupKeysRes.get(i), e.getKey().get(i)); | ||
| } | ||
| map.putAll(e.getValue()); | ||
| return map; | ||
| }) | ||
| .sorted((m1, m2) -> { | ||
| for (String key : groupKeysRes) { | ||
| Object value1 = m1.get(key); | ||
| Object value2 = m2.get(key); | ||
| int cmp = compareValues(value1, value2); | ||
| if (cmp != 0) { | ||
| return cmp; | ||
| } | ||
| } | ||
| return 0; | ||
| }) | ||
| .toList(); | ||
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| return list; | ||
| } | ||
|
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| /** | ||
| * We use this instead of e.g. apoc.coll.sortMulti | ||
| * since we have to handle the NULL_ROLLUP values as well | ||
| */ | ||
| private static int compareValues(Object value1, Object value2) { | ||
| if (value1 == null && value2 == null) { | ||
| return 0; | ||
| } else if (value1 == null) { | ||
| return 1; | ||
| } else if (value2 == null) { | ||
| return -1; | ||
| } else if (NULL_ROLLUP.equals(value1) && NULL_ROLLUP.equals(value2)) { | ||
| return 0; | ||
| } else if (NULL_ROLLUP.equals(value1)) { | ||
| return 1; | ||
| } else if (NULL_ROLLUP.equals(value2)) { | ||
| return -1; | ||
| } else if (value1 instanceof Comparable && value2 instanceof Comparable) { | ||
| try { | ||
| return ((Comparable<Object>) value1).compareTo(value2); | ||
| } catch (Exception e) { | ||
| // e.g. different data types, like int and strings | ||
| return 0; | ||
| } | ||
|
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| } else { | ||
| return 0; | ||
| } | ||
| } | ||
| } | ||
| } |
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