Read hypertable max time value with an ordered scan - #10379
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The max value of a hypertable's open dimension was read with a max() aggregate. For UUID time columns the aggregate argument is an expression that extracts the timestamp from the UUID. Because the argument is an expression and not a plain column, the planner cannot rewrite the aggregate into a min/max aggregate, so it reads every row instead. Also lock down search_path for the SPI execution and fix a sql injection vulnerability in the UUID path.
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The max value of a hypertable's open dimension was read with a max()
aggregate. For UUID time columns the aggregate argument is an expression
that extracts the timestamp from the UUID. Because the argument is an
expression and not a plain column, the planner cannot rewrite the
aggregate into a min/max aggregate, so it reads every row instead.
Also lock down search_path for the SPI execution and fix a sql
injection vulnerability in the UUID path.