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fixed typo and added info that union can take any number of dataSources
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@ -17,12 +17,12 @@ The table data source is the most common type. It's represented by a string, or
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```
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### Union Data Source
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This data source unions two table data sources.
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This data source unions two or more table data sources.
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```json
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{
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"type": "union",
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"dataSources": ["<string_value1>", "string_value2>"]
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"dataSources": ["<string_value1>", "<string_value2>", "<string_value3>", ... ]]
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}
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```
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