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Add documentation re alphabetical sorted of MV dimensions #10695

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clintropolis merged 1 commit into from
May 7, 2021
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Add documentation re alphabetical sorted of MV dimensions #10695

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1 change: 1 addition & 0 deletions docs/ingestion/index.md
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Expand Up @@ -480,6 +480,7 @@ Dimension objects can have the following components:
| type | Either `string`, `long`, `float`, or `double`. | `string` |
| name | The name of the dimension. This will be used as the field name to read from input records, as well as the column name stored in generated segments.<br><br>Note that you can use a [`transformSpec`](#transformspec) if you want to rename columns during ingestion time. | none (required) |
| createBitmapIndex | For `string` typed dimensions, whether or not bitmap indexes should be created for the column in generated segments. Creating a bitmap index requires more storage, but speeds up certain kinds of filtering (especially equality and prefix filtering). Only supported for `string` typed dimensions. | `true` |
| multiValueHandling | Specify the type of handling for [multi-value fields](../querying/multi-value-dimensions.md). Possible values are `sorted_array`, `sorted_set`, and `array`. `sorted_array` and `sorted_set` order the array upon ingestion. `sorted_set` removes duplicates. `array` ingests data as-is | `sorted_array` |

#### Inclusions and exclusions

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2 changes: 1 addition & 1 deletion docs/querying/multi-value-dimensions.md
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Expand Up @@ -25,7 +25,7 @@ title: "Multi-value dimensions"

Apache Druid supports "multi-value" string dimensions. These are generated when an input field contains an
array of values instead of a single value (e.g. JSON arrays, or a TSV field containing one or more `listDelimiter`
characters).
characters). By default Druid ingests the values in alphabetical order, see [Dimension Objects](../ingestion/index.md#dimension-objects) for configuration.

This document describes the behavior of groupBy (topN has similar behavior) queries on multi-value dimensions when they
are used as a dimension being grouped by. See the section on multi-value columns in
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1 change: 1 addition & 0 deletions website/.spelling
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Expand Up @@ -1875,3 +1875,4 @@ TiB
PiB
protobuf
Golang
multiValueHandling