[jira] [Updated] (IGNITE-7711) Explain the case-sensitivity of schema and table/cache

["Denis Magda (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-7711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Denis Magda updated IGNITE-7711:
--------------------------------
    Fix Version/s:     (was: 2.5)
                   2.6

> Explain the case-sensitivity of schema and table/cache
> ------------------------------------------------------
>
>                 Key: IGNITE-7711
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7711
>             Project: Ignite
>          Issue Type: Task
>          Components: documentation
>            Reporter: Denis Magda
>            Priority: Major
>             Fix For: 2.6
>
>
> Users don't get how to use table and schema name in Ignite:
> [https://stackoverflow.com/questions/48723946/apache-ignite-querying-a-cache-through-an-sql-driver]
> The confusion comes from the interpretation of term "case-insensitive". All SQL databases work this way:
>  
> 1) If I create some object and define its name without quotes, a database will convert it to upper case (sometimes lower case). Then if I query this object without quotes, a query is also transformed to upper case. This is what I call "case-insensitivity" - it doesn't matter how you refer to this object, it works still.
> CREATE TABLE myTable -> CREATE TABLE MYTABLE
> SELECT FROM myTable -> SELECT FROM MYTABLE -> OK
> SELECT FROM MyTable -> SELECT FROM MYTABLE -> OK
> SELECT FROM "myTable" -> SELECT FROM myTable -> *{color:#ff0000}FAIL!{color}*
>  
> 2) If I create an object with quotes, then the database doesn't convert it to upper case, and the original name in quotes is *the only way* to access the object:
> CREATE TABLE "myTable" -> CREATE TABLE myTable
> SELECT FROM myTable -> SELECT FROM MYTABLE -> *{color:#ff0000}FAIL!{color}*
> SELECT FROM MyTable -> SELECT FROM MYTABLE -> *{color:#ff0000}FAIL!{color}*SELECT FROM "myTable" -> SELECT FROM myTable -> OK
>  
> Now back to Ignite case. Our schemas are case-sensitive. so the only way to access it is through quotes:
> CREATE SCHEMA "cacheName"; // This is what Ignite does internally
> SELECT * FROM "cacheName".myTable -> OK
> SELECT * FROM cacheName.myTable -> *{color:#ff0000}FAIL!{color}*
>  
> Our users know this, and all their queries are written with schema names in quotation marks. Now consider what would happen should we change schema names to case-insensitive mode:
> CREATE SCHEMA cacheName;
> SELECT * FROM "cacheName".myTable -> *{color:#ff0000}FAIL, +all old quries start to fail!+{color}*
> SELECT * FROM cacheName.myTable -> OK, now it works



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