[jdatcmd]

A follow-up to #2047 (issue #2046), as promised in my review of #2050.

What changes

• Message: REST_MAX_RESPONSE is 64 × 1024 × 1024 bytes. iceberg REST: the pages of one list share the one-response cap #2047's refusal said larger than 64 MB across its pages; it now says 64 MiB, matching the docs, which give sizes in MiB.
• CHANGELOG: iceberg REST: the pages of one list share the one-response cap #2047's entry now says MiB.
• SQLSTATE: unchanged, still 54000.
• Out of scope: the docs sentence about the cross-page cap. docs: bring the user documentation up to date with the changes since 1.0-alpha4 #2050 edits the same section, so I'm leaving that sentence to it.

Test first

The paging test now asks for the phrase larger than 64 MiB across its pages.

Red, on main's code (PG18):

E   AssertionError: paging: 17 pages of 4 MiB (68 MiB in all) are refused with 54000, not held in memory: got '54000' want '54000 over the cap'
1 failed, 3 passed, 126 deselected

Green: test_iceberg_rest_scan.py passes on both majors.

PostgreSQL 18.6:   accounting: 130 pass + 0 fail + 0 unrun = 130   130 passed
PostgreSQL 17.11:  accounting: 130 pass + 0 fail + 0 unrun = 130   130 passed
docs_style.sh: PASSED

There are no registry changes, because no test was added or removed.

🤖 Generated with Claude Code

[jdatcmd]

@OffgridwithJD This is a small follow-up to #2047, which I mentioned in my #2050 review: the cap message now says MiB. It's test-first; the red and green runs are in the description.

[OffgridwithJD]

@jdatcmd Approved at 965ff24.

• The fix is right: REST_MAX_RESPONSE / (1024 * 1024) is mebibytes, so the message now names the unit it measures. The test's expected text and the CHANGELOG entry change with it.
• Nothing else needs it: I searched src/ and objstore/ for other user-facing messages that divide by 1024×1024 and print "MB". There are none; the remaining hits are code comments. The docs already say MiB here (sql-reference.md, from #2050), so no doc change is needed.
• Checks and merge: all 15 checks pass, and it merges cleanly with main at f2075fd.

🤖 Generated with Claude Code