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56.5. Examples
ThePostgreSQL source distribution includes several examples of index methods implemented usingGiST. The core system currently provides text search support (indexing fortsvector andtsquery) as well as R-Tree equivalent functionality for some of the built-in geometric data types (seesrc/backend/access/gist/gistproc.c). The followingcontrib modules also containGiST operator classes: B-tree equivalent functionality for several data types Indexing for multidimensional cubes Module for storing (key, value) pairs RD-Tree for one-dimensional array of int4 values Indexing for tree-like structures Text similarity using trigram matching Indexing for"float ranges"