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https://issues.apache.org/jira/browse/PHOENIX-514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14295810#comment-14295810
]
ASF GitHub Bot commented on PHOENIX-514:
----------------------------------------
Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/34#discussion_r23721101
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/index/IndexMaintainer.java ---
@@ -976,20 +1043,33 @@ private void initCachedState() {
ref.getFamily(), ref.getQualifier())));
}
- this.allColumns =
Sets.newLinkedHashSetWithExpectedSize(indexedColumns.size() +
coveredColumns.size());
+ this.allColumns =
Sets.newLinkedHashSetWithExpectedSize(indexedExpressions.size() +
coveredColumns.size());
+ // columns that are required to evaluate all expressions in
indexedExpressions (not including columns in data row key)
+ this.indexedColumns =
Sets.newLinkedHashSetWithExpectedSize(indexedExpressions.size());
+ for (Expression expression : indexedExpressions) {
+ KeyValueExpressionVisitor visitor = new
KeyValueExpressionVisitor() {
+ @Override
+ public Void visit(KeyValueColumnExpression expression) {
+ indexedColumns.add(new
ColumnReference(expression.getColumnFamily(), expression.getColumnName()));
+ indexedColumnTypes.add(expression.getDataType());
--- End diff --
Good point. This is fine.
> Support functional indexes
> --------------------------
>
> Key: PHOENIX-514
> URL: https://issues.apache.org/jira/browse/PHOENIX-514
> Project: Phoenix
> Issue Type: Task
> Reporter: James Taylor
> Assignee: Thomas D'Silva
> Labels: enhancement
>
> Instead of only defining the set of columns from the data table that make up
> an index, you should be able to use expressions. For example:
> CREATE INDEX upper_last_name_idx ON person (UPPER(last_name))
> Then in queries that use UPPER(last_name), we can replace them with column
> references to the index table.
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