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From "Gokcen Iskender (Jira)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-6267) View Index PK Fixed Width Field Truncation
Date Wed, 16 Dec 2020 22:08:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-6267?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gokcen Iskender updated PHOENIX-6267:
-------------------------------------
    Description: 
1. Create a table T
 2. Create a view V that extends the PK of T, where the last field of the view's PK is a fixed
width column C such as an INTEGER or BIGINT
 3. Create a view index VI on V that does NOT contain C in its index key
 4. Select C from the view with a query that runs against the view index

You will get the following error:
{code:java}
 java.sql.SQLException: ERROR 201 (22000): Illegal data. Expected length of at least 8 bytes,
but had 7
{code}
[~giskender], [~kadir], [~tkhurana] and I investigated. It appears the problem comes from

 IndexMaintainer.buildRowKey:707-713
{code:java}
            int length = stream.size();
            int minLength = length - maxTrailingNulls;
            byte[] indexRowKey = stream.getBuffer();
            // Remove trailing nulls
            while (length > minLength && indexRowKey[length-1] == QueryConstants.SEPARATOR_BYTE)
{
                length--;
            }
{code}
The logic to remove trailing separator bytes shouldn't run if the end of the index key (i.e
the end of the base PK) is a fixed width column. Otherwise, we'll truncate whenever the last
byte of the fixed width field happens to be \x00

 

This only happens for view indexes (mutitenant or not)

  was:
1. Create a table T
2. Create a view V that extends the PK of T, where the last field of the view's PK is a fixed
width column C such as an INTEGER or BIGINT
3. Create a view index VI on V that does NOT contain C in its index key
4. Select C from the view with a query that runs against the view index

You will get the following error: 

{code:java}
 java.sql.SQLException: ERROR 201 (22000): Illegal data. Expected length of at least 8 bytes,
but had 7
{code}

[~giskender], [~kadir], [~tkhurana] and I investigated. It appears the problem comes from

IndexMaintainer.buildRowKey:707-713

{code:java}
            int length = stream.size();
            int minLength = length - maxTrailingNulls;
            byte[] indexRowKey = stream.getBuffer();
            // Remove trailing nulls
            while (length > minLength && indexRowKey[length-1] == QueryConstants.SEPARATOR_BYTE)
{
                length--;
            }
{code}

The logic to remove trailing separator bytes shouldn't run if the end of the index key (i.e
the end of the base PK) is a fixed width column. Otherwise, we'll truncate whenever the last
byte of the fixed width field happens to be \x00



> View Index PK Fixed Width Field Truncation 
> -------------------------------------------
>
>                 Key: PHOENIX-6267
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6267
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 5.0.0, 4.15.0, 4.14.3
>            Reporter: Geoffrey Jacoby
>            Assignee: Gokcen Iskender
>            Priority: Blocker
>             Fix For: 5.1.0, 4.16.0
>
>
> 1. Create a table T
>  2. Create a view V that extends the PK of T, where the last field of the view's PK is
a fixed width column C such as an INTEGER or BIGINT
>  3. Create a view index VI on V that does NOT contain C in its index key
>  4. Select C from the view with a query that runs against the view index
> You will get the following error:
> {code:java}
>  java.sql.SQLException: ERROR 201 (22000): Illegal data. Expected length of at least
8 bytes, but had 7
> {code}
> [~giskender], [~kadir], [~tkhurana] and I investigated. It appears the problem comes
from 
>  IndexMaintainer.buildRowKey:707-713
> {code:java}
>             int length = stream.size();
>             int minLength = length - maxTrailingNulls;
>             byte[] indexRowKey = stream.getBuffer();
>             // Remove trailing nulls
>             while (length > minLength && indexRowKey[length-1] == QueryConstants.SEPARATOR_BYTE)
{
>                 length--;
>             }
> {code}
> The logic to remove trailing separator bytes shouldn't run if the end of the index key
(i.e the end of the base PK) is a fixed width column. Otherwise, we'll truncate whenever the
last byte of the fixed width field happens to be \x00
>  
> This only happens for view indexes (mutitenant or not)



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