Julian Hyde created CALCITE-2569:
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Summary: UDFs that are table functions must implement
SqlTableFunction and have CURSOR as their return type
Key: CALCITE-2569
URL: https://issues.apache.org/jira/browse/CALCITE-2569
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
UDFs that are table functions must implement SqlTableFunction and have CURSOR
as their return type,
Validate that table functions are not used in contexts that require scalar
functions, such as the SELECT clause.
Change operand type ANY to mean 'scalar expression of any type (but not a
cursor)', and add operand type IGNORE to mean skip validation - for an operand
that is not an expression. TABLE is one of the few operators that accepts a
CURSOR operand.
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