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Posted to issues@calcite.apache.org by "Alessandro Solimando (Jira)" <ji...@apache.org> on 2020/12/10 17:38:00 UTC

[jira] [Created] (CALCITE-4436) Use the fields order from the struct type for 'ITEM(STRUCT, INDEX)' access

Alessandro Solimando created CALCITE-4436:
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             Summary: Use the fields order from the struct type for 'ITEM(STRUCT, INDEX)' access
                 Key: CALCITE-4436
                 URL: https://issues.apache.org/jira/browse/CALCITE-4436
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: 1.27.0
            Reporter: Alessandro Solimando
            Assignee: Alessandro Solimando


The index-based access via the "ITEM" operator for operands of row/struct type is currently experimental and disabled by default.

Its implementation uses the fields order from `getDeclaredFields()`, a JVM-specific feature, this might lead to silent data corruption (see [PR-2230|https://github.com/apache/calcite/pull/2230]).

The aim of the ticket is to improve the feature by relying on the safer fields order 
from the struct field type itself (_i.e._, `relType.getFields()[index]`) so that we can enable it by default.



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