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Added section on union data sources

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Igal Levy 2014-10-29 12:32:24 -07:00
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docs/content/DataSource.md
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---
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
{
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}
```
### Union Data Source
This data source unions two table data sources.
```json
{
"type": "union",
"dataSources": ["<string_value1>", "string_value2>"]
}
```
### Query Data Source
```json
{