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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6956) Create table as Select cannot copy Decimal columns
Date Tue, 15 Aug 2017 02:08:00 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126720#comment-16126720
] 

Rick Hillegas commented on DERBY-6956:
--------------------------------------

The CREATE TABLE AS SELECT statement fails because we flunk the following check...

                (getMaximumWidth() <= typeId.getMaximumMaximumWidth());

at line 1859 in DataTypeDescriptor.java. That, in turn is because the maximum width accounts
for a sign byte and a decimal point byte in addition to the maximum number of digits in the
decimal. I don't know yet why that check is necessary.

> Create table as Select cannot copy Decimal columns
> --------------------------------------------------
>
>                 Key: DERBY-6956
>                 URL: https://issues.apache.org/jira/browse/DERBY-6956
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, SQL
>    Affects Versions: 10.13.1.1
>         Environment: Windows 7, DataGrip
>            Reporter: Murat Cengiz
>              Labels: newbie
>
> I create a test table with the following query:
> CREATE TABLE "DERBYTEST" ("STRINGCOLUMN" varchar(255), "INTEGERCOLUMN" integer, "SHORTCOLUMN"
varchar(255), "LONGCOLUMN" bigint, "DOUBLECOLUMN" double, "FLOATCOLUMN" double, "DECIMALCOLUMN"
decimal(31, 6), "BOOLEANCOLUMN" smallint, "DATECOLUMN" timestamp, "DATETIMECOLUMN" timestamp,
"ID" integer, "LASTMODTIME" timestamp, PRIMARY KEY ("ID"))
> this query completes successfully
> I later try to copy the table with the following query:
> CREATE TABLE "DERBYTEST_TEMP" AS SELECT * FROM DERBYTEST WITH NO DATA
> This throws the following exception:
> [42X71][30000] Invalid data type 'DECIMAL(31, 6)' for column 'DECIMALCOLUMN'
> Everything works perfectly fine if I remove the decimal column.



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