[YSQL] Paging read time cleanup

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[YSQL] Paging read time cleanup #23569

Open pao214 opened 4 weeks ago

pao214 commented 4 weeks ago

Jira Link: DB-12487

Description

Read time must be consistent for a read snapshot. The concept of a paging read time is vestigial and should be removed.

Issue Type

kind/bug

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pao214 commented 2 weeks ago

Paging read time may be necessary for catalog requests. Catalog requests have a read time different from the user table requests. Moreover, the boundaries on catalog requests are not clear. We need to figure out how to save read time for catalog requests before removing paging read time.