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I've never heard of Calcite before and dug a bit deeper into this project and found it to be quite active. Only taking into consideration changes to Java files, this is the repo activity for the last 12 months:

     month  | authors | commits | files | churn 
   ---------+---------+---------+-------+-------
    2022-02 |      21 |      62 |    84 |  4387
    2022-01 |      26 |     109 |   243 | 32429
    2021-12 |      33 |      99 |   198 | 10461
    2021-11 |      19 |      49 |    77 |  6960
    2021-10 |      26 |      64 |   371 | 13626
    2021-09 |      18 |      41 |    68 |  2258
    2021-08 |      11 |      17 |    25 |  1924
    2021-07 |      17 |      30 |    51 |  2704
    2021-06 |      14 |      31 |    28 |  1708
    2021-05 |       9 |      17 |    35 |  1606     
    2021-04 |      11 |      46 |    99 |  4224
    2021-03 |      16 |      36 |   143 |  8471

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select commit_ym AS month, count(distinct(author_email)) as authors, count(distinct(commit_id)) as commits, count(distinct(path_id)) as files, sum(total) as churn from z1_commits_422 as commits, z1_changes_422 as changes, z1_code_churn_422 as churn where commits.id=changes.commit_id and changes.code_churn_id=churn.id and lang='java' group by commit_ym order by commit_ym desc limit 12