release-22.2: sql: fix CREATE AS [SHOW CREATE FUNCTION] job failure #108167
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Backport 3/3 commits from #107567.
/cc @cockroachdb/release
Fixes #106268
Previously
CREATE TABLE AS
/CREATE MATERIALIZED VIEW AS
sourcing fromSHOW CREATE FUNCTION <function>
generated a failing schema change job with aunknown function: f(): function undefined
error because the job runs in the system database and functions cannot be referenced cross database.This PR fixes this by using the original user session (which includes the database) in the schema change job.
Release note (bug fix): Fixes the schema changer job when CREATE AS sources from SHOW CREATE FUNCTION:
CREATE TABLE t AS SELECT * FROM [SHOW CREATE FUNCTION f];
Release justification: CREATE AS bug fix.