Aman Sinha created DRILL-3764:
---------------------------------
Summary: Support the ability to identify and/or skip records when
a function evaluation fails
Key: DRILL-3764
URL: https://issues.apache.org/jira/browse/DRILL-3764
Project: Apache Drill
Issue Type: Improvement
Components: Functions - Drill
Affects Versions: 1.1.0
Reporter: Aman Sinha
Assignee: Mehant Baid
Drill can point out the filename and location of corrupted records in a file
but it does not have a good mechanism to deal with the following scenario:
Consider a text file with 2 records:
{code}
$ cat t4.csv
10,2001
11,http://www.cnn.com
{code}
{code}
0: jdbc:drill:zk=local> alter session set `exec.errors.verbose` = true;
0: jdbc:drill:zk=local> select cast(columns[0] as init), cast(columns[1] as
bigint) from dfs.`t4.csv`;
Error: SYSTEM ERROR: NumberFormatException: http://www.cnn.com
Fragment 0:0
[Error Id: 72aad22c-a345-4100-9a57-dcd8436105f7 on 10.250.56.140:31010]
(java.lang.NumberFormatException) http://www.cnn.com
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.nfeL():91
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.varCharToLong():62
org.apache.drill.exec.test.generated.ProjectorGen1.doEval():62
org.apache.drill.exec.test.generated.ProjectorGen1.projectRecords():62
org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.doWork():172
{code}
The problem is user does not have the context of where the error occurred
-either the file name or the record number. This becomes a pain point
especially when CTAS is being used to do data conversion from (say) text format
to Parquet format. The CTAS may be accessing thousands of files and 1 such
casting (or another function) failure aborts the query.
It would substantially improve the user experience if we provided:
1) the filename and record number where this failure occurred
2) the ability to skip such records depending on a session option
3) the ability to write such records to a staging table for future ingestion
Please see discussion on dev list:
http://mail-archives.apache.org/mod_mbox/drill-dev/201509.mbox/%3cCAFyDVvLuPLgTNZ56S6=J=9Vb=aBs=pdw7nrhkkdupbdxgfa...@mail.gmail.com%3e
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