Question

Which of the following expressions builds a search-time bloom filter?

1) An eval expression
2) A macro expression
3) A regular expression
4) A lispy expression

Answer 1

A macro expression is what builds a search-time bloom filter. Macros are used to define reusable filters for search queries to quickly assess set membership without scanning entire datasets.

Step-by-step explanation:

The expression that builds a search-time bloom filter is a macro expression. Bloom filters are data structures that are used to test whether an element is a member of a set. They are efficient in terms of space but allow for some false positives. In the context of a search engine or database query optimization, a macro can be used to define a filter that will be applied to search queries in order to quickly determine if a record matches without having to scan the entire dataset. Macros are essentially saved search-time commands that can be reused in other search queries.