[SPARK-21147] the schema of socket/rate source can not be set.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0, 2.2.0
• Fix Version/s: 2.3.0
• Component/s: Structured Streaming

Environment

Win7,spark 2.1.0

• Assignee: Hyukjin Kwon
• Reporter: Fei Shao
• Created: 20/Jun/17 01:43
• Updated: 12/Dec/22 17:35
• Resolved: 21/Jun/17 17:52

Description

The schema set for DataStreamReader can not work. The code is shown as below:
val line = ss.readStream.format("socket")
.option("ip",xxx)
.option("port",xxx)
.schema( StructField("name",StringType)::StructField("area",StringType)::Nil)
.load
line.printSchema

The printSchema prints:
root

--value:String(nullable=true)

According to the code, it should print the schema set by schema().

Suggestion from Michael Armbrust:
throw an exception saying that you can't set schema here.

Issue Links

• links to: [Github] Pull Request #18365 (HyukjinKwon)