Apache
/
druid
mirror of https://github.com/apache/druid.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'master' of github.com:metamx/druid into druid-0.7.x

This commit is contained in:
fjy 2014-11-11 17:30:30 -08:00
parent 6188315293 6396d01dea
commit 26b358e127
1 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
docs/content/DataSource.md
View File

@ -1,18 +1,34 @@
---
layout: doc_page
---
A data source is the Druid equivalent of a database table. However, a query can also masquerade as a data source, providing subquery-like functionality. Query data sources are currently only supported by [GroupBy](GroupByQuery.html) queries.
## Datasources
A data source is the Druid equivalent of a database table. However, a query can also masquerade as a data source, providing subquery-like functionality. Query data sources are currently supported only by [GroupBy](GroupByQuery.html) queries.
### Table Data Source
The table data source the most common type. It's represented by a string, or by the full structure:
The table data source is the most common type. It's represented by a string, or by the full structure:
```json
{
"type": "table",
"name": <string_value>
"name": "<string_value>"
}
```
### Union Data Source
This data source unions two or more table data sources.
```json
{
"type": "union",
"dataSources": ["<string_value1>", "<string_value2>", "<string_value3>", ... ]
}
```
Note that the data sources being unioned should have the same schema.
### Query Data Source
```json
{