In https://www.cybertec-postgresql.com/en/ideas-for-scaling-postgresql-to-multi-terabyte-and-beyond/ it is mentioned: "GIN, the most know non-default index type perhaps, has been actually around for ages (full-text search) and in short is perfect for indexing columns where there are lot of repeating values – think all kinds of statuses or good old Mr/Mrs/Miss. GIN only stores every unique column value only once as for the default B-tree you’ll have e.g. 1 millon leaf nodes with the integer “1” in it." Does it mean that GIN is a very good choice for low cardinality columns.
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