ADO.NET Provider for Elasticsearch

Build 20.0.7654

ORDER BY 関数

MAPFIELD(column, data_type)

Used to explicitly specify a mapping (by sending the 'unmapped_type' sort option) for a column that does not have a mapping associated with it, which will enable sorting on the column. By default, if a column does not have a mapping, an exception will be thrown containing an error message similar to: "No mapping found for [column] in order to sort on".

Example SQL Query:

SELECT * FROM employee ORDER BY MAPFIELD(start_date, 'long') DESC 
Elasticsearch Sort:
{"start_date":{"order":"desc", "unmapped_type": "long"}}

  • column: The column to perform the order by on.
  • data_type: The Elasticsearch data type to map the column to.

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Build 20.0.7654