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Commit 04901dd0 authored by Takeshi Yamamuro's avatar Takeshi Yamamuro Committed by Xiao Li
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[SPARK-20431][SQL] Specify a schema by using a DDL-formatted string 

## What changes were proposed in this pull request?
This pr supported a DDL-formatted string in `DataFrameReader.schema`.
This fix could make users easily define a schema without importing  `o.a.spark.sql.types._`.

## How was this patch tested?
Added tests in `DataFrameReaderWriterSuite`.

Author: Takeshi Yamamuro <yamamuro@apache.org>

Closes #17719 from maropu/SPARK-20431.
parent 7144b518
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