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https://issues.apache.org/jira/browse/FLINK-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15860504#comment-15860504
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ASF GitHub Bot commented on FLINK-5714:
---------------------------------------
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3273#discussion_r100454106
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/sources/CsvTableSource.scala
---
@@ -138,4 +141,160 @@ class CsvTableSource(
inputFormat
}
+
+ override def equals(other: Any): Boolean = other match {
+ case that: CsvTableSource => returnType == that.returnType &&
+ path == that.path &&
+ fieldDelim == that.fieldDelim &&
+ rowDelim == that.rowDelim &&
+ quoteCharacter == that.quoteCharacter &&
+ ignoreFirstLine == that.ignoreFirstLine &&
+ ignoreComments == that.ignoreComments &&
+ lenient == that.lenient
+ case _ => false
+ }
+
+ override def hashCode(): Int = {
+ val state = Seq(returnType)
+ state.map(_.hashCode()).foldLeft(0)((a, b) => 31 * a + b)
+ }
+}
+
+object CsvTableSource {
+
+ /**
+ * A builder for creating [[CsvTableSource]] instances.
+ *
+ * For example:
+ *
+ * {{{
+ * val source: CsvTableSource = new CsvTableSourceBuilder()
+ * .path("/path/to/your/file.csv")
+ * .field("myfield", Types.STRING)
+ * .field("myfield2", Types.INT)
+ * .build()
+ * }}}
+ *
+ */
+ class Builder {
+
+ private val fieldNames: ListBuffer[String] = ListBuffer[String]()
--- End diff --
Can we bind the name and type to a MutableMap and do some check when we
adding fields? Like can not have duplicated filed names?
> Use a builder pattern for creating CsvTableSource
> -------------------------------------------------
>
> Key: FLINK-5714
> URL: https://issues.apache.org/jira/browse/FLINK-5714
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Jark Wu
>
> Right now, the constructor of the CsvTableSource can have up to 9 parameters.
> In Scala this might not be a problem because of default values, but Java
> doesn't have this functionality.
> I propose to have a builder pattern here:
> {code}
> CsvTableSource
> .builder()
> .field("myfield", Types.STRING)
> .field("myfield2", Types.INT)
> .quoteCharacter(';')
> .build()
> {code}
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