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sql: add FOR UPDATE locking modes to EXPLAIN output
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Relates to #40205.

This change adds FOR UPDATE locking mode information to the EXPLAIN
output of scanNodes. This is useful for testing that locking modes are
being correctly propagated when a FOR [KEY] UPDATE/SHARE locking clause
is specified. It will be even more useful for testing that locking clauses
are being implicitly applied to UPDATE, UPSERT, and DELETE statements when
we start performing that implicit transformation to their underlying scans.
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@nvanbenschoten
nvanbenschoten committed Feb 6, 2020
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