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[PROPOSAL]: Index nested fields #347

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[PROPOSAL]: Index nested fields#347
#379 (+3)
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@andrei-ionescu

Description

@andrei-ionescu
andrei-ionescu
opened on Jan 31, 2021

Problem description

This design proposal is for adding support for nested fields in both indexedColumns and includedColumns.

Currently, Hyperspace does not support nested fields like structs or structured arrays.

Having the possibility to use nested fields with Hyperspace would be of great benefit to everybody.

Goal

The user should be able to create and index with nested fields and use it in queries.

For example:

hs.createIndex(
  df, 
  IndexConfig(
    "idx_nested", 
    indexedColumns = Seq("nested.nst.field1"), 
    includedColumns = Seq("id", "name", "nested.nst.field2")
  )
)

Proposed solution

Using the same Hyperspace APIs indexes over nested fields should work as for other simple fields.

Given the nestedDataset dataset with schema

root
 |-- id: integer (nullable = true)
 |-- name: string (nullable = true)
 |-- nested: struct (nullable = true)
 |    |-- field1: string (nullable = true)
 |    |-- nst: struct (nullable = true)
 |    |    |-- field1: string (nullable = true)
 |    |    |-- field2: string (nullable = true)

and the following data

+---+-----+-----------------+
|id |name |nested           |
+---+-----+-----------------+
|2  |name2|[va2, [wa2, wb2]]|
|1  |name1|[va1, [wa1, wb1]]|
+---+-----+-----------------+

This is the way and index on field1 field with other 2 projection fields can be created

hs.createIndex(
  nestedDataset, 
  IndexConfig(
    "idx_nested", 
    indexedColumns = Seq("nested.nst.field1"), 
    includedColumns = Seq("id", "name", "nested.nst.field2")))

Adding the support for nested fields impacts the following areas:

  • Validate nested column names
  • Modify the create index action
  • Modify the filter and rule index functions

Creating the index

Given the dataset defined above with the listed data, after doing

hs.createIndex(
  df, 
  IndexConfig(
    "idx_nested", 
    indexedColumns = Seq("nested.nst.field1"), 
    includedColumns = Seq("id", "name", "nested.nst.field2")))

the following dataset will be created

root
 |-- nested__nst__field1: string (nullable = true)
 |-- id: integer (nullable = true)
 |-- name: string (nullable = true)
 |-- nested__nst__field2: string (nullable = true)

+-------------------+---+-----+-------------------+
|nested__nst__field1| id| name|nested__nst__field2|
+-------------------+---+-----+-------------------+
|                wa1|  1|name1|                wb1|
|                wa2|  2|name2|                wb2|
+-------------------+---+-----+-------------------+

It is important to understand that the name of the field of the index column is a non-nested column and due to parquet quirkiness on using . (dot) in the field name, it has to be properly renamed and at query time projected as it was.

Search query

Given the following search/filter query

df.filter(df("nested.nst.field1") === "wa1").select("id", "name", "nested.nst.field2")

The optimized and spark plans without index are

Project [id#100, name#101, nested#102.nst.field2]
+- Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))
   +- Relation[id#100,name#101,nested#102] parquet

Project [id#100, name#101, nested#102.nst.field2]
+- Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))
   +- FileScan parquet [id#100,name#101,nested#102] Batched: false, Format: Parquet, 
        Location: InMemoryFileIndex[file:/..../tableN2], PartitionFilters: [], 
        PushedFilters: [IsNotNull(nested)], ReadSchema:
        struct<id:int,name:string,nested:struct<field1:string,nst:struct<field1:string,field2:string>>>

The transformed optimized and spark plans should look like

Project [id#1, name#2, nested__nst__field2#3]
+- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
   +- Relation[nested__nst__field1#0,id#1,name#2,nested__nst__field2#3]
        Hyperspace(Type: CI, Name: idx_nested, LogVersion: 1)

Project [id#1, name#2, nested__nst__field2#3]
+- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
   +- FileScan parquet [nested__nst__field1#0,id#1,name#2,nested__nst__field2#3] Batched: false, 
        Format: Parquet, Location: InMemoryFileIndex[file:/..../spark_warehouse/indexes/idx_nested/v__=0],
        PartitionFilters: [], PushedFilters: [IsNotNull(nested__nst__field1)], ReadSchema: 
        struct<nested__nst__field1:string,id:int,name:string,nested__nst__field2:string>

Complexities

Transforming the plan

Filters inside the plan must be modified to accomodate the index schema not the data schema - the flattened schema not the nested field. Instead of accessing the field with GetStructField(GetStructField(AttributeReference)) it must directly access with AttributeReference.

Given the query plan

Project [id#100, name#101, nested#102.nst.field2]
+- Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))
   +- Relation[id#100,name#101,nested#102] parquet

The filter must be modified from

Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))

to

Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))

The projection from

Project [id#100, name#101, nested#102.nst.field2]

to

Project [id#1, name#2, nested__nst__field2#3]

The relation from

Relation[id#100,name#101,nested#102] parquet

to

Relation[nested__nst__field1#0, id#1,name#2, nested__nst__field2#3] Hyperspace(Type: CI, 
  Name: idx_nested, LogVersion: 1)

Hybrid scans

The transforment plans for Hybrid scans will have need to accomodate the union between the latest files arriving in the dataset having the following schema

root
 |-- id: integer (nullable = true)
 |-- name: string (nullable = true)
 |-- nested: struct (nullable = true)
 |    |-- field1: string (nullable = true)
 |    |-- nst: struct (nullable = true)
 |    |    |-- field1: string (nullable = true)
 |    |    |-- field2: string (nullable = true)

and the index schema

root
 |-- nested__nst__field1: string (nullable = true)
 |-- id: integer (nullable = true)
 |-- name: string (nullable = true)
 |-- nested__nst__field2: string (nullable = true)

Search queries

Files Appended

The optimized plan

Union
:- Project [id#1, name#2, nested__nst__field2#3]
:  +- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
:     +- Relation[nested__nst__field1#0,id#1,name#2,nested__nst__field2#3] 
:        Hyperspace(Type: CI, Name: idx_nested, LogVersion: 1)
+- Project [id#100, name#101, nested#102.nst.field2]
   +- Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))
      +- Relation[id#1,name#2,nested#102] parquet

The Spark plan

Union
:- Project [id#1, name#2, nested__nst__field2#3]
:  +- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
:     +- FileScan parquet [nested__nst__field1#0,id#1,name#2,nested__nst__field2#3] Batched: false, 
:          Format: Parquet, Location: InMemoryFileIndex[file:/..../spark_warehouse/indexes/idx_nested/v__=0], 
:          PartitionFilters: [], PushedFilters: [IsNotNull(nested__nst__field1)], ReadSchema: 
:          struct<nested__nst__field1:string,id:int,name:string,nested__nst__field2:string>
+- Project [id#100, name#101, nested#102.nst.field2]
   +- Filter (isnotnull(nested#102) && (nested#102.nst.field1 = wa1))
      +- FileScan parquet [id#100,name#101,nested#102] Batched: false, Format: Parquet, 
           Location: InMemoryFileIndex[file:/..../tableN2/appended_file.parquet], 
           PartitionFilters: [], PushedFilters: [IsNotNull(nested)], ReadSchema: 
           struct<id:int,name:string,nested:struct<field1:string,nst:struct<field1:string,field2:string>>>

Files Deleted

The optimized plan

Project [id#1, name#2, nested__nst__field2#3]
+- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
   +- Project [nested__nst__field1#0, id#1, name#2, nested__nst__field2#3]
      +- Filter NOT (_data_file_id#368L = 3)
         +- Relation[nested__nst__field1#0,id#1,name#2,nested__nst__field2#3,_data_file_id#368L] 
              Hyperspace(Type: CI, Name: indexWithLineage, LogVersion: 1)

The Spark plan

Project [id#1, name#2, nested__nst__field2#3]
+- Filter (isnotnull(nested__nst__field1#0) && (nested__nst__field1#0 = wa1))
   +- Project [nested__nst__field1#0, id#1, name#2, nested__nst__field2#3]
      +- Filter NOT (_data_file_id#368L = 3)
         +- FileScan parquet [nested__nst__field1#0,id#1,name#2,nested__nst__field2#3] Batched: false, 
              Format: Parquet, Location: InMemoryFileIndex[file:/..../spark_warehouse/indexes/idx_nested/v__=0], 
              PartitionFilters: [], PushedFilters: [IsNotNull(nested__nst__field1)], ReadSchema: 
              struct<nested__nst__field1:string,id:int,name:string,nested__nst__field2:string>

Join queries

The following join queries will have a dataset a bit different from the one at the beginning. The following are extracted from the HybridScanForNestedFieldsTest tests.

root
 |-- Date: string (nullable = true)
 |-- RGUID: string (nullable = true)
 |-- Query: string (nullable = true)
 |-- imprs: integer (nullable = true)
 |-- clicks: integer (nullable = true)
 |-- nested: struct (nullable = true)
 |    |-- id: string (nullable = true)
 |    |-- leaf: struct (nullable = true)
 |    |    |-- id: string (nullable = true)
 |    |    |-- cnt: integer (nullable = true)

Join append only

Original plan

Project [cnt#556, query#533, id#557, Date#543, id#563]
+- Join Inner, (cnt#556 = cnt#562)
   :- Project [nested#536.leaf.cnt AS cnt#556, query#533, nested#536.leaf.id AS id#557]
   :  +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && (nested#536.leaf.cnt <= 40))
   :     +- Relation[Date#531,RGUID#532,Query#533,imprs#534,clicks#535,nested#536] parquet
   +- Project [nested#548.leaf.cnt AS cnt#562, Date#543, nested#548.leaf.id AS id#563]
      +- Filter ((isnotnull(nested#548) && (nested#548.leaf.cnt <= 40)) && (nested#548.leaf.cnt >= 20))
         +- Relation[Date#543,RGUID#544,Query#545,imprs#546,clicks#547,nested#548] parquet

Altered optimized plan

Project [cnt#653, query#533, id#654, Date#543, id#660]
+- Join Inner, (cnt#653 = cnt#659)
   :- BucketUnion 200 buckets, bucket columns: [cnt]
   :  :- Project [nested__leaf__cnt#0 AS cnt#653, query#1 AS query#533, nested__leaf__id#2 AS id#654]
   :  :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 >= 20)) && 
   :  :     :      (nested__leaf__cnt#0 <= 40))
   :  :     +- Relation[nested__leaf__cnt#0,Query#1,nested__leaf__id#2] 
   :  :          Hyperspace(Type: CI, Name: index_Append, LogVersion: 1)
   :  +- RepartitionByExpression [cnt#653], 200
   :     +- Project [nested#536.leaf.cnt AS cnt#653, query#533, nested#536.leaf.id AS id#654]
   :        +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && 
   :           :      (nested#536.leaf.cnt <= 40))
   :           +- Relation[Query#533,nested#536] parquet
   +- BucketUnion 200 buckets, bucket columns: [cnt]
      :- Project [nested__leaf__cnt#0 AS cnt#659, Date#1 AS Date#543, nested__leaf__id#2 AS id#660]
      :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 <= 40)) && 
      :     :      (nested__leaf__cnt#0 >= 20))
      :     +- Relation[nested__leaf__cnt#0,Date#1,nested__leaf__id#2] 
      :          Hyperspace(Type: CI, Name: indexType2_Append, LogVersion: 1)
      +- RepartitionByExpression [cnt#659], 200
         +- Project [nested#548.leaf.cnt AS cnt#659, Date#543, nested#548.leaf.id AS id#660]
            +- Filter ((isnotnull(nested#548) && (nested#548.leaf.cnt <= 40)) && 
               :      (nested#548.leaf.cnt >= 20))
               +- Relation[Date#543,nested#548] parquet

Altered Spark plan

Project [cnt#653, query#533, id#654, Date#543, id#660]
+- SortMergeJoin [cnt#653], [cnt#659], Inner
   :- BucketUnion 200 buckets, bucket columns: [cnt]
   :  :- Project [nested__leaf__cnt#0 AS cnt#653, query#1 AS query#533, nested__leaf__id#2 AS id#654]
   :  :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 >= 20)) && 
   :  :     :      (nested__leaf__cnt#0 <= 40))
   :  :     +- FileScan Hyperspace(Type: CI, Name: index_Append, LogVersion: 1) 
   :  :          [nested__leaf__cnt#0,Query#1,nested__leaf__id#2] 
   :  :          Batched: true, Format: Parquet, 
   :  :          Location: InMemoryFileIndex[file:/.../spark_warehouse/indexes/...],
   :  :          PartitionFilters: [], PushedFilters: [IsNotNull(nested__leaf__cnt), 
   :  :          GreaterThanOrEqual(nested__leaf__cnt,20), LessThanOrEqual(nested__leaf__cnt,40), 
   :  :          ReadSchema: struct<nested__leaf__cnt:int,Query:string,nested__leaf__id:string>, 
   :  :          SelectedBucketsCount: 200 out of 200
   :  +- Exchange hashpartitioning(cnt#653, 200)
   :     +- Project [nested#536.leaf.cnt AS cnt#653, query#533, nested#536.leaf.id AS id#654]
   :        +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && 
   :           :      (nested#536.leaf.cnt <= 40))
   :           +- FileScan parquet [Query#533,nested#536] Batched: false, Format: Parquet, 
   :                Location: InMemoryFileIndex[file:/.../..., PartitionFilters: [], 
   :                PushedFilters: [IsNotNull(nested)], 
   :                ReadSchema: struct<Query:string,nested:struct<id:string,leaf:struct<id:string,cnt:int>>>
   +- BucketUnion 200 buckets, bucket columns: [cnt]
      :- Project [nested__leaf__cnt#0 AS cnt#659, Date#1 AS Date#543, nested__leaf__id#2 AS id#660]
      :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 <= 40)) && 
      :     :      (nested__leaf__cnt#0 >= 20))
      :     +- FileScan Hyperspace(Type: CI, Name: indexType2_Append, LogVersion: 1) 
      :          [nested__leaf__cnt#0,Date#1,nested__leaf__id#2]
      :          Batched: true, Format: Parquet, 
      :          Location: InMemoryFileIndex[file://.../spark_warehouse/indexes/...], 
      :          PartitionFilters: [], PushedFilters: [IsNotNull(nested__leaf__cnt), 
      :          LessThanOrEqual(nested__leaf__cnt,40), GreaterThanOrEqual(nested__leaf__cnt,20), 
      :          ReadSchema: struct<nested__leaf__cnt:int,Date:string,nested__leaf__id:string>, 
      :          SelectedBucketsCount: 200 out of 200
      +- Exchange hashpartitioning(cnt#659, 200)
         +- Project [nested#548.leaf.cnt AS cnt#659, Date#543, nested#548.leaf.id AS id#660]
            +- Filter ((isnotnull(nested#548) && (nested#548.leaf.cnt <= 40)) && 
               :      (nested#548.leaf.cnt >= 20))
               +- FileScan parquet [Date#543,nested#548] Batched: false, Format: Parquet, 
                    Location: InMemoryFileIndex[file:/.../..., PartitionFilters: [], 
                    PushedFilters: [IsNotNull(nested)], 
                    ReadSchema: struct<Date:string,nested:struct<id:string,leaf:struct<id:string,cnt:int>>>

Delete files

Original plan

Project [cnt#556, query#533, Date#543]
+- Join Inner, (cnt#556 = cnt#560)
   :- Project [nested#536.leaf.cnt AS cnt#556, query#533]
   :  +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && 
   :     :      (nested#536.leaf.cnt <= 40))
   :     +- Relation[Date#531,RGUID#532,Query#533,imprs#534,clicks#535,nested#536] parquet
   +- Project [nested#548.leaf.cnt AS cnt#560, Date#543]
      +- Filter ((isnotnull(nested#548) && (nested#548.leaf.cnt <= 40)) && 
         :      (nested#548.leaf.cnt >= 20))
         +- Relation[Date#543,RGUID#544,Query#545,imprs#546,clicks#547,nested#548] parquet

Altered optimized plan

Project [cnt#605, query#533, Date#543]
+- Join Inner, (cnt#605 = cnt#609)
   :- Project [nested__leaf__cnt#0 AS cnt#605, query#1 AS query#533]
   :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 >= 20)) && 
   :     :      (nested__leaf__cnt#0 <= 40))
   :     +- Project [nested__leaf__cnt#0, Query#1, nested__leaf__id#2]
   :        +- Filter NOT _data_file_id#615L IN (2,3)
   :           +- Relation[nested__leaf__cnt#0,Query#1,nested__leaf__id#2,_data_file_id#615L] 
   :                Hyperspace(Type: CI, Name: index_Delete, LogVersion: 1)
   +- Project [nested__leaf__cnt#0 AS cnt#609, Date#1 AS Date#543]
      +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 <= 40)) && 
         :      (nested__leaf__cnt#0 >= 20))
         +- Project [nested__leaf__cnt#0, Date#1, nested__leaf__id#2]
            +- Filter NOT _data_file_id#616L IN (2,3)
               +- Relation[nested__leaf__cnt#0,Date#1,nested__leaf__id#2,_data_file_id#616L] 
                    Hyperspace(Type: CI, Name: indexType2_Delete2, LogVersion: 1)

Altered Spark plan

Project [cnt#605, query#533, Date#543]
+- SortMergeJoin [cnt#605], [cnt#609], Inner
   :- Project [nested__leaf__cnt#0 AS cnt#605, query#1 AS query#533]
   :  +- Filter (((NOT _data_file_id#615L IN (2,3) && isnotnull(nested__leaf__cnt#0)) && 
   :     :      (nested__leaf__cnt#0 >= 20)) && (nested__leaf__cnt#0 <= 40))
   :     +- FileScan Hyperspace(Type: CI, Name: index_Delete, LogVersion: 1) 
   :          [nested__leaf__cnt#0,Query#1,_data_file_id#615L] 
   :          Batched: true, Format: Parquet, 
   :          Location: InMemoryFileIndex[file:/.../spark_warehouse/indexes/...], 
   :          PartitionFilters: [], PushedFilters: [Not(In(_data_file_id, [2,3])), 
   :          IsNotNull(nested__leaf__cnt), GreaterThanOrEqual(nested__leaf__cnt,20),  
   :          ReadSchema: struct<nested__leaf__cnt:int,Query:string,_data_file_id:bigint>, 
   :          SelectedBucketsCount: 200 out of 200
   +- Project [nested__leaf__cnt#0 AS cnt#609, Date#1 AS Date#543]
      +- Filter (((NOT _data_file_id#616L IN (2,3) && isnotnull(nested__leaf__cnt#0)) && 
         :      (nested__leaf__cnt#0 <= 40)) && (nested__leaf__cnt#0 >= 20))
         +- FileScan Hyperspace(Type: CI, Name: indexType2_Delete2, LogVersion: 1) 
              [nested__leaf__cnt#0,Date#1,_data_file_id#616L] 
              Batched: true, Format: Parquet, 
              Location: InMemoryFileIndex[file:/.../spark_warehouse/indexes/...], 
              PartitionFilters: [], PushedFilters: [Not(In(_data_file_id, [2,3])), 
              IsNotNull(nested__leaf__cnt), LessThanOrEqual(nested__leaf__cnt,40), 
              ReadSchema: struct<nested__leaf__cnt:int,Date:string,_data_file_id:bigint>, 
              SelectedBucketsCount: 200 out of 200

Append + Delete

Original plan

Project [cnt#556, query#533, Date#543]
+- Join Inner, (cnt#556 = cnt#560)
   :- Project [nested#536.leaf.cnt AS cnt#556, query#533]
   :  +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && (nested#536.leaf.cnt <= 40))
   :     +- Relation[Date#531,RGUID#532,Query#533,imprs#534,clicks#535,nested#536] parquet
   +- Project [nested#548.leaf.cnt AS cnt#560, Date#543]
      +- Filter ((isnotnull(nested#548) && (nested#548.leaf.cnt <= 40)) && (nested#548.leaf.cnt >= 20))
         +- Relation[Date#543,RGUID#544,Query#545,imprs#546,clicks#547,nested#548] parquet

Altered optimized plan

Project [cnt#617, query#533, Date#543]
+- Join Inner, (cnt#617 = cnt#621)
   :- BucketUnion 200 buckets, bucket columns: [cnt]
   :  :- Project [nested__leaf__cnt#0 AS cnt#617, query#1 AS query#533]
   :  :  +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 >= 20)) && 
   :  :     :      (nested__leaf__cnt#0 <= 40))
   :  :     +- Project [nested__leaf__cnt#0, Query#1, nested__leaf__id#2]
   :  :        +- Filter NOT (_data_file_id#627L = 3)
   :  :           +- Relation[nested__leaf__cnt#0,Query#1,nested__leaf__id#2,_data_file_id#627L] 
   :  :                Hyperspace(Type: CI, Name: index_Both, LogVersion: 1)
   :  +- RepartitionByExpression [cnt#617], 200
   :     +- Project [nested#536.leaf.cnt AS cnt#617, query#533]
   :        +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && 
   :           :      (nested#536.leaf.cnt <= 40))
   :           +- Relation[Query#533,nested#536] parquet
   +- Project [nested__leaf__cnt#0 AS cnt#621, Date#1 AS Date#543]
      +- Filter ((isnotnull(nested__leaf__cnt#0) && (nested__leaf__cnt#0 <= 40)) && 
         :      (nested__leaf__cnt#0 >= 20))
         +- Project [nested__leaf__cnt#0, Date#1, nested__leaf__id#2]
            +- Filter NOT _data_file_id#628L INSET (2,3)
               +- Relation[nested__leaf__cnt#0,Date#1,nested__leaf__id#2,_data_file_id#628L] 
                    Hyperspace(Type: CI, Name: indexType2_Delete, LogVersion: 1)

Altere Spark plan

Project [cnt#617, query#533, Date#543]
+- SortMergeJoin [cnt#617], [cnt#621], Inner
   :- BucketUnion 200 buckets, bucket columns: [cnt]
   :  :- Project [nested__leaf__cnt#0 AS cnt#617, query#1 AS query#533]
   :  :  +- Filter (((NOT (_data_file_id#627L = 3) && isnotnull(nested__leaf__cnt#0)) &&
   :  :     :      (nested__leaf__cnt#0 >= 20)) && (nested__leaf__cnt#0 <= 40))
   :  :     +- FileScan Hyperspace(Type: CI, Name: index_Both, LogVersion: 1) 
   :  :          [nested__leaf__cnt#0,Query#1,_data_file_id#627L] 
   :  :          Batched: true, Format: Parquet, 
   :  :          Location: InMemoryFileIndex[file:/.../spark_warehouse/indexes/...], 
   :  :          PartitionFilters: [], PushedFilters: [Not(EqualTo(_data_file_id,3)), 
   :  :          IsNotNull(nested__leaf__cnt), GreaterThanOrEqual(nested__leaf__cnt,20), 
   :  :          ReadSchema: struct<nested__leaf__cnt:int,Query:string,_data_file_id:bigint>, 
   :  :          SelectedBucketsCount: 200 out of 200
   :  +- Exchange hashpartitioning(cnt#617, 200)
   :     +- Project [nested#536.leaf.cnt AS cnt#617, query#533]
   :        +- Filter ((isnotnull(nested#536) && (nested#536.leaf.cnt >= 20)) && 
   :           :      (nested#536.leaf.cnt <= 40))
   :           +- FileScan parquet [Query#533,nested#536] Batched: false, Format: Parquet, 
   :                Location: InMemoryFileIndex[file:/.../...], 
   :                PartitionFilters: [], PushedFilters: [IsNotNull(nested)], 
   :                ReadSchema: struct<Query:string,nested:struct<id:string,leaf:struct<id:string,cnt:int>>>
   +- Project [nested__leaf__cnt#0 AS cnt#621, Date#1 AS Date#543]
      +- Filter (((NOT _data_file_id#628L INSET (2,3) && isnotnull(nested__leaf__cnt#0)) && 
         :      (nested__leaf__cnt#0 <= 40)) && (nested__leaf__cnt#0 >= 20))
         +- FileScan Hyperspace(Type: CI, Name: indexType2_Delete, LogVersion: 1) 
              [nested__leaf__cnt#0,Date#1,_data_file_id#628L] 
              Batched: true, Format: Parquet, 
              Location: InMemoryFileIndex[file:/.../spark_warehouse/indexes/..., 
              PartitionFilters: [], PushedFilters: [Not(In(_data_file_id, [2,3])), 
              IsNotNull(nested__leaf__cnt), LessThanOrEqual(nested__leaf__cnt,40),
              ReadSchema: struct<nested__leaf__cnt:int,Date:string,_data_file_id:bigint>, 
              SelectedBucketsCount: 200 out of 200

Impact

There should be no impact on the current Hyperspace implementations.

Background

This is a result of #312 discussion.

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