[SEDONA-137] Fix ST_Buffer for Flink to work

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Labels: pull-request-available
• Assignee: Kengo Seki
• Reporter: Kengo Seki
• Created: 06/Aug/22 13:26
• Updated: 22/Oct/22 16:16
• Resolved: 22/Oct/22 16:16

Description

I tried to use the ST_Buffer function on Flink, but came across the following error.

org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: SQL validation failed. An error occurred in the type inference logic of function 'ST_Buffer'.

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Caused by: org.apache.flink.table.api.ValidationException: SQL validation failed. An error occurred in the type inference logic of function 'ST_Buffer'.

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Caused by: org.apache.flink.table.api.ValidationException: An error occurred in the type inference logic of function 'ST_Buffer'.

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Caused by: org.apache.flink.table.api.ValidationException: Could not extract a valid type inference for function class 'org.apache.sedona.flink.expressions.Functions$ST_Buffer'. Please check for implementation mistakes and/or provide a corresponding hint.

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Caused by: org.apache.flink.table.api.ValidationException: Error in extracting a signature to output mapping.

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Caused by: org.apache.flink.table.api.ValidationException: Unable to extract a type inference from method:

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Caused by: org.apache.flink.table.api.ValidationException: Could not extract a data type from 'class java.lang.Object' in parameter 0 of method 'eval' in class 'org.apache.sedona.flink.expressions.Functions$ST_Buffer'. Please pass the required data type manually or allow RAW types.

It seems to be caused by the lack of @DataTypeHint for the first parameter of ST_Buffer.eval.

Issue Links

• links to: GitHub Pull Request #657