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https://issues.apache.org/jira/browse/DERBY-2335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mamta A. Satoor updated DERBY-2335:
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Attachment:
DERBY2335_Use_PushDataValueFactory_in_ExpressionClassBuilder_v1_stat.txt
DERBY2335_Use_PushDataValueFactory_in_ExpressionClassBuilder_v1_diff.txt
I am attaching a temporary patch
DERBY2335_Use_PushDataValueFactory_in_ExpressionClassBuilder_v1_diff.txt (not
ready for commit yet since the code needs to be cleaned up a little.) I want to
go ahead and post it so Mike can try it out for his testing without running
into stack trace that Army ran into earlier this week. This patch uses the
existing method PushDataValueFactory in ExpressionClassBuilder rather than the
new method in BaseTypeCompiler. Mike, please let me know how this patch works
with your testing. Once I have cleanedup the code and run few tests of my own,
I will go ahead and commit it.
> Compare character datatypes with different collation ordering.
> --------------------------------------------------------------
>
> Key: DERBY-2335
> URL: https://issues.apache.org/jira/browse/DERBY-2335
> Project: Derby
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 10.3.0.0
> Reporter: Mamta A. Satoor
> Assigned To: Mamta A. Satoor
> Attachments:
> DERBY2335_correct_collation_for_constants_persistent_column_v1_diff.txt,
> DERBY2335_correct_collation_for_constants_persistent_column_v1_stat.txt,
> DERBY2335_fix_stringCompare_Method_CollatorSQLxxx_classes_v1_diff.txt,
> DERBY2335_fix_stringCompare_Method_CollatorSQLxxx_classes_v1_stat.txt,
> DERBY2335_More_tests_And_Fix_getNull_v1_diff.txt,
> DERBY2335_More_tests_And_Fix_getNull_v1_stat.txt,
> DERBY2335_Use_LCC_in_ValueNode_v1_diff.txt,
> DERBY2335_Use_LCC_in_ValueNode_v1_stat.txt,
> DERBY2335_Use_PushDataValueFactory_in_ExpressionClassBuilder_v1_diff.txt,
> DERBY2335_Use_PushDataValueFactory_in_ExpressionClassBuilder_v1_stat.txt
>
>
> The parent task DERBY-1478 will enable users to have a different collation
> order for user-defined character datatypes compared to UNICODE based
> collation, UCS_BASIC, used by system tables. This sub-task is added to handle
> the case where a comparison is made between character datatypes with
> different collation order.
> For instance
> Let's say, a database is created to use a territory based collation for
> character types. And say there is a userSchema schema in that database which
> has a table tableInfo with column tablename defined as VARCHAR. This
> tableInfo.tablename will have territory based collation assoicated with it.
> And say this column is then compared with a VARCHAR column in SYS schema,
> then how will the comparison happen, since the 2 columns being compared have
> different collation associated with them?
> select * from sys.systables and userSchema.tableInfo where
> systables.tablename = tableInfo,tablename
> Thanks to Rick for taking the time out on this issue. He had following
> suggestion
> </Rick comment start>
> "As I read part 2 of the SQL Standard, it looks like you need a CAST in order
> to compare 2 strings which have different collations bound to them. Both
> string operands must have the same collation--that is my reading of Syntax
> rule 3b in section 9.13. Sections 6.12 and 6.1 explain how to cast the
> operands so that you can compare them. I think you need to write an
> expression like this:
> WHERE userStringCol = CAST ( systemStringCol AS VARCHAR COLLATE
> userStringColumnsCollation )
> Here's an example I googled up:
> http://docs.openlinksw.com/virtuoso/sqlrefDATATYPES.html. Hope this helps.
> </Rick comment end>
> When this task is taken up, it would be good to explore Rick's suggestion.
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