PostgreSQL: pgbitmap 0.9.3

[NewsBot]

A new PostgreSQL blog post/announcement has been posted!

Announcing the latest Beta release of pgbitmap, available from pgxn and github.

pgbitmap provides a bitmap datatype for Postgres with a full set of functions, operators and aggregates.

This release fixes a number of issues with empty bitmaps and is considered a production release candidate. Any and all feedback is welcomed.

A bitmap is an array of bits, indexed by an integer. Bitmaps provide an efficient means to implement sets of integers. pgbitmap provides functions and operators for:

• creating new bitmaps;
• adding elements to bitmaps;
• removing elements from bitmaps;
• testing for inclusion of elements in bitmaps;
• finding the minimum and maximum bits in bitmaps;
• unioning bitmaps together (set union/logical or);
• intersecting bitmaps (set intersection/logical and);
• subtracting one bitmap from another;
• converting bitmaps to and from textual representations;
• converting bitmaps to and from arrays;
• aggregating bits and bitmaps into bitmaps.

It differs from the standard Postgres bitstring in that it isn't based around bit zero (bitmap(1000000) does not contain 1,000,000 zeroes followed by a 1) and it has more functionality.

It was developed primarily in order to efficiently manage sets of privileges for Virtual Private Database implementations.

Full documentation is available here

Get the full details here: PostgreSQL: pgbitmap 0.9.3

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