Gustavo de Morais created FLINK-39915:
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Summary: Throw a clear validation error when mixing positional and
named function arguments
Key: FLINK-39915
URL: https://issues.apache.org/jira/browse/FLINK-39915
Project: Flink
Issue Type: Improvement
Components: Table SQL / API
Affects Versions: 2.3.0
Reporter: Gustavo de Morais
Assignee: Gustavo de Morais
Calling a function with a mix of positional and named arguments - e.g. `f(TABLE
t, op => DESCRIPTOR(x))` - fails during validation with a generic calcite
assertion error instead of a helpful message.
Root cause is in Calcite's operand permutation: once any argument is named it
assumes all are, and a positional argument trips an assertion.
Detect the mix early in `FlinkCalciteSqlValidator` and throw a
`ValidationException` telling the user to use either all positional or all
named arguments. Affects every function with named-argument support (process
table functions, table functions, scalar functions).
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