[jira] [Created] (SPARK-37016) Publicise UpperCaseCharStream

[dohongdayi (Jira)]

dohongdayi created SPARK-37016:
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             Summary: Publicise UpperCaseCharStream
                 Key: SPARK-37016
                 URL: https://issues.apache.org/jira/browse/SPARK-37016
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0, 3.1.2, 3.1.1, 3.0.3, 2.4.8, 2.3.4, 2.2.3
            Reporter: dohongdayi


Many Spark extension projects are copying `UpperCaseCharStream` because it is 
private beneath `parser` package, such as:

[Hudi|https://github.com/apache/hudi/blob/3f8ca1a3552bb866163d3b1648f68d9c4824e21d/hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/spark/sql/parser/HoodieCommonSqlParser.scala#L112]

[Iceberg|https://github.com/apache/iceberg/blob/c3ac4c6ca74a0013b4705d5bd5d17fade8e6f499/spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/parser/extensions/IcebergSparkSqlExtensionsParser.scala#L175]

[Delta 
Lake|https://github.com/delta-io/delta/blob/625de3b305f109441ad04b20dba91dd6c4e1d78e/core/src/main/scala/io/delta/sql/parser/DeltaSqlParser.scala#L290]

[Submarine|https://github.com/apache/submarine/blob/2faebb8efd69833853f62d89b4f1fea1b1718148/submarine-security/spark-security/src/main/scala/org/apache/submarine/spark/security/parser/UpperCaseCharStream.scala#L31]

[Kyuubi|https://github.com/apache/incubator-kyuubi/blob/8a5134e3223844714fc58833a6859d4df5b68d57/dev/kyuubi-extension-spark-common/src/main/scala/org/apache/kyuubi/sql/zorder/ZorderSparkSqlExtensionsParserBase.scala#L108]

[Spark-ACID|https://github.com/qubole/spark-acid/blob/19bd6db757677c40f448e85c74d9995ba97d5942/src/main/scala/com/qubole/spark/datasources/hiveacid/sql/catalyst/parser/ParseDriver.scala#L13]

We can publicise `UpperCaseCharStream` to eliminate code duplication.



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