pub fn collapse_lex_req(input: LexRequirement) -> LexRequirement👎Deprecated since 45.0.0: Use LexRequirement::collapse
Expand description
This function constructs a duplicate-free LexOrderingReq by filtering out
duplicate entries that have same physical expression inside. For example,
vec![a Some(ASC), a Some(DESC)] collapses to vec![a Some(ASC)].
It will also filter out entries that are ordered if the next entry is;
for instance, vec![floor(a) Some(ASC), a Some(ASC)] will be collapsed to
vec![a Some(ASC)].