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https://issues.apache.org/jira/browse/SPARK-22165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263686#comment-16263686
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Hyukjin Kwon commented on SPARK-22165:
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[~cloud_fan], BTW, should we maybe leave a release-notes tag too?
> Type conflicts between dates, timestamps and date in partition column
> ---------------------------------------------------------------------
>
> Key: SPARK-22165
> URL: https://issues.apache.org/jira/browse/SPARK-22165
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.1, 2.2.0, 2.3.0
> Reporter: Hyukjin Kwon
> Assignee: Hyukjin Kwon
> Priority: Minor
> Fix For: 2.3.0
>
>
> It looks we have some bugs when resolving type conflicts in partition column.
> I found few corner cases as below:
> Case 1: timestamp should be inferred but date type is inferred.
> {code}
> val df = Seq((1, "2015-01-01"), (2, "2016-01-01 00:00:00")).toDF("i", "ts")
> df.write.format("parquet").partitionBy("ts").save("/tmp/foo")
> spark.read.load("/tmp/foo").printSchema()
> {code}
> {code}
> root
> |-- i: integer (nullable = true)
> |-- ts: date (nullable = true)
> {code}
> Case 2: decimal should be inferred but integer is inferred.
> {code}
> val df = Seq((1, "1"), (2, "1" * 30)).toDF("i", "decimal")
> df.write.format("parquet").partitionBy("decimal").save("/tmp/bar")
> spark.read.load("/tmp/bar").printSchema()
> {code}
> {code}
> root
> |-- i: integer (nullable = true)
> |-- decimal: integer (nullable = true)
> {code}
> Looks we should de-duplicate type resolution logic if possible rather than
> separate numeric precedence-like comparison alone.
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