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https://issues.apache.org/jira/browse/SPARK-36663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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mcdull_zhang updated SPARK-36663:
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Attachment: image-2021-09-03-20-56-28-846.png
> When the existing field name is a number, an error will be reported when
> reading the orc file
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-36663
> URL: https://issues.apache.org/jira/browse/SPARK-36663
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.3, 3.1.2
> Reporter: mcdull_zhang
> Priority: Critical
> Attachments: image-2021-09-03-20-56-28-846.png
>
>
> You can use the following methods to reproduce the problem:
> {quote}val path = "file:///tmp/test_orc"
> spark.range(1).withColumnRenamed("id", "100").repartition(1).write.orc(path)
> spark.read.orc(path)
> {quote}
> The error message is like this:
> {quote}org.apache.spark.sql.catalyst.parser.ParseException:
> mismatched input '100' expecting {'ADD', 'AFTER'....
> == SQL ==
> struct<100:bigint>
> -------^^^
> {quote}
> The error is actually issued by this line of code:
> {quote}CatalystSqlParser.parseDataType("100:bigint")
> {quote}
>
> The specific background is that spark calls the above code in the process of
> converting the schema of the orc file into the catalyst schema.
> {quote}// code in OrcUtils
> private def toCatalystSchema(schema: TypeDescription): StructType = {
>
> CharVarcharUtils.replaceCharVarcharWithStringInSchema(CatalystSqlParser.parseDataType(schema.toString).asInstanceOf[StructType])
> }{quote}
> There are two solutions I currently think of:
> # Modify the syntax analysis of SparkSQL to identify this kind of schema
> # The TypeDescription.toString method should add the quote symbol to the
> numeric column name, because the following syntax is supported:
> {quote}CatalystSqlParser.parseDataType("`100`:bigint"){quote}
> But currently TypeDescription does not support changing the UNQUOTED_NAMES
> variable, should we first submit a pr to the orc project to support the
> configuration of this variable。
> !image-2021-09-03-20-53-35-626.png!
>
> How do spark members think about this issue?
>
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