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From "Yair Lenga (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4555) Expand SYSCS_IMPORT_TABLE to accept CSV file with header lines
Date Sun, 19 Jun 2016 06:25:05 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338405#comment-15338405
] 

Yair Lenga commented on DERBY-4555:
-----------------------------------

Thanks for your work on the ticket.

I hate picking on details - but can you consider a better name than 'SYSCS_IMPORT_TABLE_SKIP_HEADER_LINES'.
Something like 'SYSCS_IMPORT_TABLE_DELIMITED' or 'SYSCS_IMPORT_TABLE_BULK'.

The SKIP_HEADER_LINES is just (minor missing) feature. The important enhancements is the ability
to import data the semi-standard CSV/TSV file.

Also, can you comment on the 2nd item in the request: the ability to load column by header
name (in addition to column number). Is this included ? or does it have to spill into a separate
ticket.

Thanks
Yair

> Expand SYSCS_IMPORT_TABLE to accept CSV file with header lines
> --------------------------------------------------------------
>
>                 Key: DERBY-4555
>                 URL: https://issues.apache.org/jira/browse/DERBY-4555
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous
>            Reporter: Yair Lenga
>            Assignee: Danoja Dias
>         Attachments: NoVarargs.diff, Varargs.diff, addNewSystemProcedure_1.diff, gotException.diff,
hardCoded.diff, latest.diff, noHeaderLines.csv, petlist.csv, petlist.csv, petlist.csv, repro.java,
repro.java, repro.java, skipHeaders.diff
>
>
> The SYSCS_IMPORT_TABLE (and SYSCS_IMPORT_DATA) function allow import of data from external
resources. In general, they can process CSV files that created with various tools - with one
exception: the header line.
> While there is no accepted standard, most tools will include a header line in the CSV
file with column names. This convention is supported in Excel and many other tools.
> My Request: extend the SYSCS_IMPORT_TABLe and SYSCS_IMPORT_DATA (and other related procedures)
to include an extra indicator for the number of header lines to be ignored.
> As an extra bonus it will be help is the SYSCS_IMPORT_DATA will accept column names (instead
of column indexes) in the 'COLUMNINDEXES' arguments. E.g., it should be possible to indicate
COLUMNINDEXES of '1,3,sales,5,'. This feature will make it significantly easier to handle
cases where the external input files is extended to include additional columns.



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