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Flex Tables

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compute_flextable_keys(flex_name[, usecols])	Computes the flex table keys and returns the predicted data types.
compute_vmap_keys(expr, vmap_col[, limit])	Computes the most frequent keys in the input VMap.
isflextable(table_name, schema)	Checks if the input relation is a flextable.
isvmap(expr, column)	Checks if the input column is a VMap.