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I have done a few previous blog posts on who has contributed to PostgreSQL, but I did not do one last year. A couple people mentioned to me that they missed it, so I decided to do one this year, and I decided to gather statistics, using basically the same methodology that I have in the past, for both 2020 and 2021. As always, it is important to remember, first, that many people contribute to the project in ways that these statistics don't capture, and second, that the statistics themselves are prone to mistakes (since there is a bunch of manual work involved) and bias (since each commit is attributed to the first author for lack of knowledge of the relative contributions of the various authors). As usual, I have posted a dump of the database I used to generate this in case anyone wants to check it over for goofs or use it for any other purpose.

I calculate that there were 176 people who were the principal author of at least one PostgreSQL commit in 2020 and 182 such people in 2021. In 2020, 13 people contributed 66% of the lines of new code, and 35 people contributed 90% of the lines of new code. In 2021, these numbers were 14 and 41 respectively. In 2020, there were a total of 2181 commits from 26 committers, and in 2021, there were 2269 commits from 28 committers. In each year, about 5 committers committed about two thirds of the non-self-authored patches, with Tom Lane leading the pack in both years.

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