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https://issues.apache.org/jira/browse/CALCITE-1955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131708#comment-16131708
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Francis Chuang commented on CALCITE-1955:
-----------------------------------------

I am also seeing this happen with a test that tests the different data types.

Through some trial and error, if a table has columns of the following type, it 
is read-only:
- CLOB
- BLOB
- VARBINARY
- BINARY

It seems the binary types and the blob types causes a table to become read-only.

> Cannot insert blob into Avatica-HSQLDB table because table is read only
> -----------------------------------------------------------------------
>
>                 Key: CALCITE-1955
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1955
>             Project: Calcite
>          Issue Type: Bug
>          Components: avatica
>            Reporter: Francis Chuang
>            Assignee: Josh Elser
>
> This might be more of a question as I am not able to find official 
> information in the HSQLDB docs.
> I am porting a test to test the insertion of binary data into a table from 
> Phoenix to HSQLDB. The test passes when using Phoenix with avatica.
> 1. I created this table:
> {code}
> CREATE TABLE some_table (
>       int INTEGER PRIMARY KEY,
>       bin BLOB
> )
> {code}
> 2. I attempt to insert the data using `INSERT INTO some_table (int, bin) 
> VALUES (?, ?)`
> The binary is being sent as a `Rep_BYTE_STRING` and the data is placed in 
> byte_values.
> This is the error I receive from HSQLDB:
> {code}
> RuntimeException: java.sql.SQLException: org.hsqldb.HsqlException: The table 
> data is read only -> SQLException: org.hsqldb.HsqlException: The table data 
> is read only -> HsqlException: org.hsqldb.HsqlException: The table data is 
> read only -> HsqlException: The table data is read only
> {code}



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