drill-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4184) Drill does not support Parquet DECIMAL values in variable length BINARY fields
Date Mon, 07 Mar 2016 21:45:41 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15183775#comment-15183775
] 

ASF GitHub Bot commented on DRILL-4184:
---------------------------------------

Github user daveoshinsky commented on a diff in the pull request:

    https://github.com/apache/drill/pull/372#discussion_r55277730
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/columnreaders/VarLengthValuesColumn.java
---
    @@ -81,6 +112,14 @@ public boolean skipReadyToReadPositionUpdate() {
         return false;
       }
     
    +  // decimalLengths list is part of a near-term fix for DRILL-4184.
    +  // Decimal[23]8SparseVector classes are fixed width vectors, without ability to "remember"
offsets of
    +  // (variable width) field sizes.  so, we "remember" the array sizes in decimalLengths
(also used to
    +  // "remember" whether a value was null, for nullable decimal columns).
    +  // TODO: storage of decimal values should support variable length values in a much
cleaner way than this,
    +  // perhaps with a new variable width Decimal vector class.
    +  protected ArrayList<Integer> decimalLengths = new ArrayList();
    --- End diff --
    
    I have moved decimalLengths class member to top of the class.  I found that the list is
NOT always accessed at the end, hence left it as a list.


> Drill does not support Parquet DECIMAL values in variable length BINARY fields
> ------------------------------------------------------------------------------
>
>                 Key: DRILL-4184
>                 URL: https://issues.apache.org/jira/browse/DRILL-4184
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Parquet
>    Affects Versions: 1.4.0
>         Environment: Windows 7 Professional, Java 1.8.0_66
>            Reporter: Dave Oshinsky
>
> Encoding a DECIMAL logical type in Parquet using the variable length BINARY primitive
type is not supported by Drill as of versions 1.3.0 and 1.4.0.  The problem first surfaces
with the ClassCastException shown below, but fixing the immediate cause of the exception is
not sufficient to support this combination (DECIMAL, BINARY) in a Parquet file.
> In Drill, DECIMAL is currently assumed to be INT32, INT64, INT96, or FIXED_LEN_BINARY_ARRAY.
 Are there any plans to support DECIMAL with variable length BINARY?  Avro definitely supports
encoding DECIMAL in variable length bytes (see https://avro.apache.org/docs/current/spec.html#Decimal),
but this support in Parquet is less clear.
> Selecting on a BINARY DECIMAL field in a parquet file throws an exception as shown below
(java.lang.ClassCastException: org.apache.drill.exec.vector.Decimal28SparseVector cannot be
cast to org.apache.drill.exec.vector.VariableWidthVector).  The successful query at bottom
selected on a string field in the same file.
> 0: jdbc:drill:zk=local> select count(*) from dfs.`c:/dao/DBArchivePredictor/tenrows.parquet`
where acct_no=70000020;
> org.apache.drill.common.exceptions.DrillRuntimeException: Error in parquet recor
> d reader.
> Message: Failure in setting up reader
> Parquet Metadata: ParquetMetaData{FileMetaData{schema: message sbi.acct_mstr {
>   required binary ACCT_NO (DECIMAL(20,0));
>   optional binary SF_NO (UTF8);
>   optional binary LF_NO (UTF8);
>   optional binary BRANCH_NO (DECIMAL(20,0));
>   optional binary INTRO_CUST_NO (DECIMAL(20,0));
>   optional binary INTRO_ACCT_NO (DECIMAL(20,0));
>   optional binary INTRO_SIGN (UTF8);
>   optional binary TYPE (UTF8);
>   optional binary OPR_MODE (UTF8);
>   optional binary CUR_ACCT_TYPE (UTF8);
>   optional binary TITLE (UTF8);
>   optional binary CORP_CUST_NO (DECIMAL(20,0));
>   optional binary APLNDT (UTF8);
>   optional binary OPNDT (UTF8);
>   optional binary VERI_EMP_NO (DECIMAL(20,0));
>   optional binary VERI_SIGN (UTF8);
>   optional binary MANAGER_SIGN (UTF8);
>   optional binary CURBAL (DECIMAL(8,2));
>   optional binary STATUS (UTF8);
> }
> , metadata: {parquet.avro.schema={"type":"record","name":"acct_mstr","namespace"
> :"sbi","fields":[{"name":"ACCT_NO","type":{"type":"bytes","logicalType":"decimal
> ","precision":20,"scale":0,"cv_auto_incr":false,"cv_case_sensitive":false,"cv_co
> lumn_class":"java.math.BigDecimal","cv_connection":"oracle.jdbc.driver.T4CConnec
> tion","cv_currency":true,"cv_def_writable":false,"cv_nullable":0,"cv_precision":
> 20,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_s
> ubscript":1,"cv_type":2,"cv_typename":"NUMBER","cv_writable":true}},{"name":"SF_
> NO","type":["null",{"type":"string","cv_auto_incr":false,"cv_case_sensitive":tru
> e,"cv_column_class":"java.lang.String","cv_currency":false,"cv_def_writable":fal
> se,"cv_nullable":1,"cv_precision":10,"cv_read_only":false,"cv_scale":0,"cv_searc
> hable":true,"cv_signed":true,"cv_subscript":2,"cv_type":12,"cv_typename":"VARCHA
> R2","cv_writable":true}]},{"name":"LF_NO","type":["null",{"type":"string","cv_au
> to_incr":false,"cv_case_sensitive":true,"cv_column_class":"java.lang.String","cv
> _currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":10,"cv_r
> ead_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscript
> ":3,"cv_type":12,"cv_typename":"VARCHAR2","cv_writable":true}]},{"name":"BRANCH_
> NO","type":["null",{"type":"bytes","logicalType":"decimal","precision":20,"scale
> ":0,"cv_auto_incr":false,"cv_case_sensitive":false,"cv_column_class":"java.math.
> BigDecimal","cv_currency":true,"cv_def_writable":false,"cv_nullable":1,"cv_preci
> sion":20,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true
> ,"cv_subscript":4,"cv_type":2,"cv_typename":"NUMBER","cv_writable":true}]},{"nam
> e":"INTRO_CUST_NO","type":["null",{"type":"bytes","logicalType":"decimal","preci
> sion":20,"scale":0,"cv_auto_incr":false,"cv_case_sensitive":false,"cv_column_cla
> ss":"java.math.BigDecimal","cv_currency":true,"cv_def_writable":false,"cv_nullab
> le":1,"cv_precision":20,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,"
> cv_signed":true,"cv_subscript":5,"cv_type":2,"cv_typename":"NUMBER","cv_writable
> ":true}]},{"name":"INTRO_ACCT_NO","type":["null",{"type":"bytes","logicalType":"
> decimal","precision":20,"scale":0,"cv_auto_incr":false,"cv_case_sensitive":false
> ,"cv_column_class":"java.math.BigDecimal","cv_currency":true,"cv_def_writable":f
> alse,"cv_nullable":1,"cv_precision":20,"cv_read_only":false,"cv_scale":0,"cv_sea
> rchable":true,"cv_signed":true,"cv_subscript":6,"cv_type":2,"cv_typename":"NUMBE
> R","cv_writable":true}]},{"name":"INTRO_SIGN","type":["null",{"type":"string","c
> v_auto_incr":false,"cv_case_sensitive":true,"cv_column_class":"java.lang.String"
> ,"cv_currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":1,"c
> v_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscr
> ipt":7,"cv_type":12,"cv_typename":"VARCHAR2","cv_writable":true}]},{"name":"TYPE
> ","type":["null",{"type":"string","cv_auto_incr":false,"cv_case_sensitive":true,
> "cv_column_class":"java.lang.String","cv_currency":false,"cv_def_writable":false
> ,"cv_nullable":1,"cv_precision":2,"cv_read_only":false,"cv_scale":0,"cv_searchab
> le":true,"cv_signed":true,"cv_subscript":8,"cv_type":12,"cv_typename":"VARCHAR2"
> ,"cv_writable":true}]},{"name":"OPR_MODE","type":["null",{"type":"string","cv_au
> to_incr":false,"cv_case_sensitive":true,"cv_column_class":"java.lang.String","cv
> _currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":2,"cv_re
> ad_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscript"
> :9,"cv_type":12,"cv_typename":"VARCHAR2","cv_writable":true}]},{"name":"CUR_ACCT
> _TYPE","type":["null",{"type":"string","cv_auto_incr":false,"cv_case_sensitive":
> true,"cv_column_class":"java.lang.String","cv_currency":false,"cv_def_writable":
> false,"cv_nullable":1,"cv_precision":4,"cv_read_only":false,"cv_scale":0,"cv_sea
> rchable":true,"cv_signed":true,"cv_subscript":10,"cv_type":12,"cv_typename":"VAR
> CHAR2","cv_writable":true}]},{"name":"TITLE","type":["null",{"type":"string","cv
> _auto_incr":false,"cv_case_sensitive":true,"cv_column_class":"java.lang.String",
> "cv_currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":30,"c
> v_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscr
> ipt":11,"cv_type":12,"cv_typename":"VARCHAR2","cv_writable":true}]},{"name":"COR
> P_CUST_NO","type":["null",{"type":"bytes","logicalType":"decimal","precision":20
> ,"scale":0,"cv_auto_incr":false,"cv_case_sensitive":false,"cv_column_class":"jav
> a.math.BigDecimal","cv_currency":true,"cv_def_writable":false,"cv_nullable":1,"c
> v_precision":20,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signe
> d":true,"cv_subscript":12,"cv_type":2,"cv_typename":"NUMBER","cv_writable":true}
> ]},{"name":"APLNDT","type":["null",{"type":"string","cv_auto_incr":false,"cv_cas
> e_sensitive":false,"cv_column_class":"java.sql.Timestamp","cv_currency":false,"c
> v_def_writable":false,"cv_nullable":1,"cv_precision":0,"cv_read_only":false,"cv_
> scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscript":13,"cv_type":93,"c
> v_typename":"DATE","cv_writable":true}]},{"name":"OPNDT","type":["null",{"type":
> "string","cv_auto_incr":false,"cv_case_sensitive":false,"cv_column_class":"java.
> sql.Timestamp","cv_currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_p
> recision":0,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":t
> rue,"cv_subscript":14,"cv_type":93,"cv_typename":"DATE","cv_writable":true}]},{"
> name":"VERI_EMP_NO","type":["null",{"type":"bytes","logicalType":"decimal","prec
> ision":20,"scale":0,"cv_auto_incr":false,"cv_case_sensitive":false,"cv_column_cl
> ass":"java.math.BigDecimal","cv_currency":true,"cv_def_writable":false,"cv_nulla
> ble":1,"cv_precision":20,"cv_read_only":false,"cv_scale":0,"cv_searchable":true,
> "cv_signed":true,"cv_subscript":15,"cv_type":2,"cv_typename":"NUMBER","cv_writab
> le":true}]},{"name":"VERI_SIGN","type":["null",{"type":"string","cv_auto_incr":f
> alse,"cv_case_sensitive":true,"cv_column_class":"java.lang.String","cv_currency"
> :false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":1,"cv_read_only":f
> alse,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscript":16,"cv_ty
> pe":12,"cv_typename":"VARCHAR2","cv_writable":true}]},{"name":"MANAGER_SIGN","ty
> pe":["null",{"type":"string","cv_auto_incr":false,"cv_case_sensitive":true,"cv_c
> olumn_class":"java.lang.String","cv_currency":false,"cv_def_writable":false,"cv_
> nullable":1,"cv_precision":1,"cv_read_only":false,"cv_scale":0,"cv_searchable":t
> rue,"cv_signed":true,"cv_subscript":17,"cv_type":12,"cv_typename":"VARCHAR2","cv
> _writable":true}]},{"name":"CURBAL","type":["null",{"type":"bytes","logicalType"
> :"decimal","precision":8,"scale":2,"cv_auto_incr":false,"cv_case_sensitive":fals
> e,"cv_column_class":"java.math.BigDecimal","cv_currency":true,"cv_def_writable":
> false,"cv_nullable":1,"cv_precision":8,"cv_read_only":false,"cv_scale":2,"cv_sea
> rchable":true,"cv_signed":true,"cv_subscript":18,"cv_type":2,"cv_typename":"NUMB
> ER","cv_writable":true}]},{"name":"STATUS","type":["null",{"type":"string","cv_a
> uto_incr":false,"cv_case_sensitive":true,"cv_column_class":"java.lang.String","c
> v_currency":false,"cv_def_writable":false,"cv_nullable":1,"cv_precision":1,"cv_r
> ead_only":false,"cv_scale":0,"cv_searchable":true,"cv_signed":true,"cv_subscript
> ":19,"cv_type":12,"cv_typename":"VARCHAR2","cv_writable":true}]}]}}}, blocks: [B
> lockMetaData{10, 1281 [ColumnMetaData{SNAPPY [ACCT_NO] BINARY  [BIT_PACKED, PLAI
> N], 4}, ColumnMetaData{SNAPPY [SF_NO] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY
> ], 88}, ColumnMetaData{SNAPPY [LF_NO] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY
> ], 163}, ColumnMetaData{SNAPPY [BRANCH_NO] BINARY  [RLE, BIT_PACKED, PLAIN_DICTI
> ONARY], 241}, ColumnMetaData{SNAPPY [INTRO_CUST_NO] BINARY  [RLE, BIT_PACKED, PL
> AIN_DICTIONARY], 298}, ColumnMetaData{SNAPPY [INTRO_ACCT_NO] BINARY  [RLE, BIT_P
> ACKED, PLAIN_DICTIONARY], 364}, ColumnMetaData{SNAPPY [INTRO_SIGN] BINARY  [RLE,
>  BIT_PACKED, PLAIN_DICTIONARY], 421}, ColumnMetaData{SNAPPY [TYPE] BINARY  [RLE,
>  BIT_PACKED, PLAIN_DICTIONARY], 478}, ColumnMetaData{SNAPPY [OPR_MODE] BINARY  [
> RLE, BIT_PACKED, PLAIN_DICTIONARY], 538}, ColumnMetaData{SNAPPY [CUR_ACCT_TYPE]
> BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 598}, ColumnMetaData{SNAPPY [TITLE]
>  BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 658}, ColumnMetaData{SNAPPY [CORP_
> CUST_NO] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 736}, ColumnMetaData{SNAPP
> Y [APLNDT] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 802}, ColumnMetaData{SNA
> PPY [OPNDT] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 919}, ColumnMetaData{SN
> APPY [VERI_EMP_NO] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 1036}, ColumnMet
> aData{SNAPPY [VERI_SIGN] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 1093}, Col
> umnMetaData{SNAPPY [MANAGER_SIGN] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY], 1
> 150}, ColumnMetaData{SNAPPY [CURBAL] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONARY]
> , 1207}, ColumnMetaData{SNAPPY [STATUS] BINARY  [RLE, BIT_PACKED, PLAIN_DICTIONA
> RY], 1270}]}]}
>         at org.apache.drill.exec.store.parquet.columnreaders.ParquetRecordReader
> .handleAndRaise(ParquetRecordReader.java:346)
>         at org.apache.drill.exec.store.parquet.columnreaders.ParquetRecordReader
> .setup(ParquetRecordReader.java:339)
>         at org.apache.drill.exec.physical.impl.ScanBatch.<init>(ScanBatch.java:1
> 01)
>         at org.apache.drill.exec.store.parquet.ParquetScanBatchCreator.getBatch(
> ParquetScanBatchCreator.java:168)
>         at org.apache.drill.exec.store.parquet.ParquetScanBatchCreator.getBatch(
> ParquetScanBatchCreator.java:56)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:151)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:131)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:131)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:131)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:131)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRecordBatch(ImplCr
> eator.java:131)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getChildren(ImplCreat
> or.java:174)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getRootExec(ImplCreat
> or.java:105)
>         at org.apache.drill.exec.physical.impl.ImplCreator.getExec(ImplCreator.j
> ava:79)
>         at org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExec
> utor.java:230)
>         at org.apache.drill.common.SelfCleaningRunnable.run(SelfCleaningRunnable
> .java:38)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
> java:1142)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
> .java:617)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassCastException: org.apache.drill.exec.vector.Decimal28SparseVector
cannot be cast to org.apache.drill.exec.vector.VariableWidthVector
>         at org.apache.drill.exec.store.parquet.columnreaders.VarLengthValuesColu
> mn.<init>(VarLengthValuesColumn.java:44)
>         at org.apache.drill.exec.store.parquet.columnreaders.VarLengthColumnRead
> ers$Decimal28Column.<init>(VarLengthColumnReaders.java:52)
>         at org.apache.drill.exec.store.parquet.columnreaders.ColumnReaderFactory
> .getReader(ColumnReaderFactory.java:178)
>         at org.apache.drill.exec.store.parquet.columnreaders.ParquetRecordReader
> .setup(ParquetRecordReader.java:319)
>         ... 22 more
> Error: SYSTEM ERROR: ClassCastException: org.apache.drill.exec.vector.Decimal28S
> parseVector cannot be cast to org.apache.drill.exec.vector.VariableWidthVector
> Fragment 0:0
> [Error Id: 22bfa8dd-1129-4300-9449-409e96d6c800 on DaveOshinsky-PC.gp.cv.commvau
> lt.com:31010] (state=,code=0)
> 0: jdbc:drill:zk=local> select count(*) from dfs.`c:/dao/DBArchivePredictor/tenr
> ows.parquet` where opr_mode='JO';
> +---------+
> | EXPR$0  |
> +---------+
> | 10      |
> +---------+
> 1 row selected (0.406 seconds)
> 0: jdbc:drill:zk=local>
> The immediate cause of this exception is that Drill, in org.apache.drill.exec.store.parquet.columnreaders.ParquetRecordReader,
assumes that all BINARY values are encoded in VariableWidthVectors.  For BINARY DECIMAL, this
is not true, as for example Decimal28SparseVector is a FixedWidthVector, not a VariableWidthVector.
  The assumption that DECIMAL is not encoded in variable length BINARY is found in a number
of other places in the Drill code, including:
> org.apache.drill.exec.store.parquet.columnreaders.ColumnReaderFactory only contains logic
to handle DECIMAL with INT32, INT64, INT96, or FIXED_LEN_BYTE_ARRAY.  BINARY is not supported
with DECIMAL.
> org.apache.drill.exec.store.parquet.columnreaders.NullableFixedByteAlignedReaders does
not support a nullable reader for BINARY in getNullableColumnReader method.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message