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https://issues.apache.org/jira/browse/FLINK-14764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977403#comment-16977403
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Timo Walther commented on FLINK-14764:
--------------------------------------
We recently added
{{org.apache.flink.table.types.logical.utils.LogicalTypeCasts}} and
corresponding tests that should serve as the reference implementation for what
we should support in the near future.
> The final Explicit/Implicit conversion matrix we should support in our planner
> ------------------------------------------------------------------------------
>
> Key: FLINK-14764
> URL: https://issues.apache.org/jira/browse/FLINK-14764
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Legacy Planner, Table SQL / Planner
> Affects Versions: 1.10.0
> Reporter: Zhenghua Gao
> Priority: Blocker
> Fix For: 1.10.0
>
> Attachments: SQL_2011_CAST_Matrix.png
>
>
> The SQL standard defines the cast specification with an explicit conversion
> matrix (SQL 2011 Part 2 Section 6.13 Syntax Rules 6)). But neither Legacy
> planner nor blink planner would follow that. IMO we should determine a final
> Explicit/Implicit conversion matrix before 1.10 (at least in blink planner).
>
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