[
https://issues.apache.org/jira/browse/CALCITE-4354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alessandro Solimando updated CALCITE-4354:
------------------------------------------
Labels: pull (was: )
> ITEM operator does not support synthetic struct type
> ----------------------------------------------------
>
> Key: CALCITE-4354
> URL: https://issues.apache.org/jira/browse/CALCITE-4354
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.27.0
> Reporter: Alessandro Solimando
> Priority: Minor
> Labels: pull
>
> The current implementation of the "ITEM" operator only supports struct/row
> type when this type if based on a class with named fields (that is, a
> non-synthetic type).
> For those non-synthetic struct types, the "ITEM" operator can be used to
> access named fields via a "string"-typed argument
> ([SqlItemOperator#96|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/fun/SqlItemOperator.java#L96]).
> The type checker accepts to apply "ITEM" on "ANY" type
> ([SqlItemOperator#49|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/fun/SqlItemOperator.java#L49]),
> and the operand checker only accepts "string"-based values
> ([SqlItemOperator.java#105|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/fun/SqlItemOperator.java#L105]).
> [SqlValidatorTest.java#L11933|https://github.com/apache/calcite/blob/master/core/src/test/java/org/apache/calcite/test/SqlValidatorTest.java#L11933]
> is an example of application of the "ITEM" operator over a struct with named
> fields.
> However, the “getAllowedSignatures” method
> ([SqlItemOperator.java#116|https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/fun/SqlItemOperator.java#L116])
> does not reflect this, and asserts a signature as follows:
> "<ARRAY>[<INTEGER>]" or "<MAP>[<VALUE>]".
> "ITEM" operator could be enriched with the support of synthetic struct/row
> type, with a positional access to the fields with a signature
> "<ROW>[<INTEGER>]".
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
