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https://issues.apache.org/jira/browse/SPARK-19228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823419#comment-15823419
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Hyukjin Kwon commented on SPARK-19228:
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Yes, inferring {{DateType}} is currently not supported (we don't have
{{tryParseDate}}). As we now have two different options, {{dateFormat}} for
{{DateType}} and {{timestampFormat}} for {{TimestampType}} each which were
unified with {{dateFormat}} option before, I think it'd make sense to make this
possible by introducing {{tryParseDate}}.
> inferSchema function processed csv date column as string and "dateFormat"
> DataSource option is ignored
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-19228
> URL: https://issues.apache.org/jira/browse/SPARK-19228
> Project: Spark
> Issue Type: Bug
> Components: Input/Output, SQL
> Affects Versions: 2.1.0
> Reporter: Sergey Rubtsov
> Labels: easyfix
> Original Estimate: 6h
> Remaining Estimate: 6h
>
> I need to process user.csv like this:
> {code}
> id,project,started,ended
> sergey.rubtsov,project0,12/12/2012,10/10/2015
> {code}
> When I add date format options:
> {code}
> Dataset<Row> users = spark.read().format("csv").option("mode",
> "PERMISSIVE").option("header", "true")
> .option("inferSchema",
> "true").option("dateFormat",
> "dd/MM/yyyy").load("src/main/resources/user.csv");
> users.printSchema();
> {code}
> expected scheme should be
> {code}
> root
> |-- id: string (nullable = true)
> |-- project: string (nullable = true)
> |-- started: date (nullable = true)
> |-- ended: date (nullable = true)
> {code}
> but the actual result is:
> {code}
> root
> |-- id: string (nullable = true)
> |-- project: string (nullable = true)
> |-- started: string (nullable = true)
> |-- ended: string (nullable = true)
> {code}
> This mean that date processed as string and "dateFormat" option is ignored
> and date processed as string.
> If I add option
> {code}
> .option("timestampFormat", "dd/MM/yyyy")
> {code}
> result is:
> {code}
> root
> |-- id: string (nullable = true)
> |-- project: string (nullable = true)
> |-- started: timestamp (nullable = true)
> |-- ended: timestamp (nullable = true)
> {code}
> I think, the issue is somewhere in object CSVInferSchema, function
> inferField, lines 80-97 and
> method "tryParseDate" need to be added before/after "tryParseTimestamp", or
> date/timestamp process logic need to be changed.
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