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https://issues.apache.org/jira/browse/DERBY-4145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas updated DERBY-4145:
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Attachment: derby-4145-01-aa-forwardReference.diff
Attaching derby-4145-01-aa-forwardReference.diff. This changes the way that we
find generation clauses which reference other generated columns.
Previously, we bound the generation clauses before looking for illegal
references. This failed if a generation clause had a forward reference to
another generated column declared later in the table's signature. Now we look
for illegal references before binding the generation clauses.
Touches the following files:
M java/engine/org/apache/derby/impl/sql/compile/GenerationClauseNode.java
Add a new method so that a generation clause can find the columns it references.
M java/engine/org/apache/derby/impl/sql/compile/AlterTableNode.java
M java/engine/org/apache/derby/impl/sql/compile/CreateTableNode.java
M java/engine/org/apache/derby/impl/sql/compile/TableElementList.java
Relocate the search for illegal references so that it happens just before we
bind the generation clauses.
M
java/testing/org/apache/derbyTesting/functionTests/tests/lang/GeneratedColumnsTest.java
Add a test case for this bug.
> NullPointerException on CREATE TABLE when generated column depends on another
> generated column
> ----------------------------------------------------------------------------------------------
>
> Key: DERBY-4145
> URL: https://issues.apache.org/jira/browse/DERBY-4145
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.1.0
> Reporter: Knut Anders Hatlen
> Assignee: Rick Hillegas
> Attachments: derby-4145-01-aa-forwardReference.diff
>
>
> ij> create table t (c1 int, c2 int, c3 generated always as (c1 + c4), c4
> generated always as (-c1));
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
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