On 8th of February, Peter Eisentraut committed patch: Per-column collation support   This adds collation support for columns and domains, a COLLATE clause to override it per expression, and B-tree index support.   Peter Eisentraut reviewed by Pavel Stehule, Itagaki Takahiro, Robert Haas, Noah Misch   Branch ------ master

On 1st of February, Tom Lane committed patch: Support LIKE and ILIKE index searches via contrib/pg_trgm indexes.   Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. ...