mirror of https://github.com/apache/druid.git
28 lines
861 B
Markdown
28 lines
861 B
Markdown
---
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layout: doc_page
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---
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The orderBy field provides the functionality to sort and limit the set of results from a groupBy query. If you group by a single dimension and are ordering by a single metric, we highly recommend using [TopN Queries](TopNQuery.html) instead. The performance will be substantially better. Available options are:
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### DefaultLimitSpec
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The default limit spec takes a limit and the list of columns to do an orderBy operation over. The grammar is:
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```json
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{
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"type" : "default",
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"limit" : <integer_value>,
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"columns" : [list of OrderByColumnSpec],
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}
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```
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#### OrderByColumnSpec
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OrderByColumnSpecs indicate how to do order by operations. Each order by condition can be a `jsonString` or a map of the following form:
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```json
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{
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"dimension" : <Any dimension or metric>,
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"direction" : "ASCENDING OR DESCENDING"
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}
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```
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