Where did the datatype get its name? Hash store?

  • I'd suggest writing a mail to the authors. Ther addresses can be found at the bottom of the documentation page. Commented Dec 12, 2014 at 9:42

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The name of the additional module hstore is derived from "hash store", because it was inspired by perl hash.
Oleg Bartunov and Teodor Sigaev - the authors of the module - say so in their presentation here:

Hstore — key/value storage (inspired by perl hash)

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