[DO NOT MERGE] just for testing

[squito]

like #12369 but with the default changed to always spill after reading -- just a way to easily run tests in this configuration.

[SparkQA]

Test build #56122 has finished for PR 12479 at commit 162e899.

• This patch fails MiMa tests.
• This patch merges cleanly.
• This patch adds no public classes.

[squito]

Jenkins, retest this please

[SparkQA]

Test build #56124 has finished for PR 12479 at commit 162e899.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.