[jira] [Commented] (HIVE-26955) Select query fails when decimal column data type is changed to string/char/varchar in Parquet

["Sourabh Badhya (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-26955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17679023#comment-17679023 ] 

Sourabh Badhya commented on HIVE-26955:
---------------------------------------

Thanks [~kkasa] and [~soumyakanti.das] for the reviews and [~tarak271] for identifying the bug.

> Select query fails when decimal column data type is changed to string/char/varchar in Parquet
> ---------------------------------------------------------------------------------------------
>
>                 Key: HIVE-26955
>                 URL: https://issues.apache.org/jira/browse/HIVE-26955
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: Taraka Rama Rao Lethavadla
>            Assignee: Sourabh Badhya
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> Steps to reproduce
> {noformat}
> create table test_parquet (id decimal) stored as parquet;
> insert into test_parquet values(238);
> alter table test_parquet change id id string;
> select * from test_parquet;
> Error: java.io.IOException: org.apache.parquet.io.ParquetDecodingException: Can not read value at 1 in block 0 in file hdfs:/namenode:8020/warehouse/tablespace/managed/hive/test_parquet/delta_0000001_0000001_0000/000000_0 (state=,code=0)
>     at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:624)
>     at org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:531)
>     at org.apache.hadoop.hive.ql.exec.FetchTask.executeInner(FetchTask.java:194)
>     ... 55 more
> Caused by: org.apache.parquet.io.ParquetDecodingException: Can not read value at 1 in block 0 in file file:/home/centos/Apache-Hive-Tarak/itests/qtest/target/localfs/warehouse/test_parquet/000000_0
>     at org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:255)
>     at org.apache.parquet.hadoop.ParquetRecordReader.nextKeyValue(ParquetRecordReader.java:207)
>     at org.apache.hadoop.hive.ql.io.parquet.read.ParquetRecordReaderWrapper.<init>(ParquetRecordReaderWrapper.java:87)
>     at org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat.getRecordReader(MapredParquetInputFormat.java:89)
>     at org.apache.hadoop.hive.ql.exec.FetchOperator$FetchInputFormatSplit.getRecordReader(FetchOperator.java:771)
>     at org.apache.hadoop.hive.ql.exec.FetchOperator.getRecordReader(FetchOperator.java:335)
>     at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:562)
>     ... 57 more
> Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo cannot be cast to org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo
>     at org.apache.hadoop.hive.ql.io.parquet.convert.ETypeConverter$8$5.convert(ETypeConverter.java:669)
>     at org.apache.hadoop.hive.ql.io.parquet.convert.ETypeConverter$8$5.convert(ETypeConverter.java:664)
>     at org.apache.hadoop.hive.ql.io.parquet.convert.ETypeConverter$BinaryConverter.addBinary(ETypeConverter.java:977)
>     at org.apache.parquet.column.impl.ColumnReaderBase$2$6.writeValue(ColumnReaderBase.java:360)
>     at org.apache.parquet.column.impl.ColumnReaderBase.writeCurrentValueToConverter(ColumnReaderBase.java:410)
>     at org.apache.parquet.column.impl.ColumnReaderImpl.writeCurrentValueToConverter(ColumnReaderImpl.java:30)
>     at org.apache.parquet.io.RecordReaderImplementation.read(RecordReaderImplementation.java:406)
>     at org.apache.parquet.hadoop.InternalParquetRecordReader.nextKeyValue(InternalParquetRecordReader.java:230)
>     ... 63 more{noformat}
> However the same is working as expected in ORC table
> {noformat}
> create table test_orc (id decimal) stored as orc;
> insert into test_orc values(238);
> alter table test_orc change id id string;
> select * from test_orc;
> +--------------+
> | test_orc.id  |
> +--------------+
> | 238          |
> +--------------+{noformat}
> As well as text table
> {noformat}
> create table test_text (id decimal) stored as textfile;
> insert into test_text values(238);
> alter table test_text change id id string;
> select * from test_text;
> +---------------+
> | test_text.id  |
> +---------------+
> | 238           |
> +---------------+{noformat}
> Similar exception is thrown when the altered datatype is varchar and char datatype.



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