Avoid calling the get_typlen multiple times (#256) #628

Job	Run time
Lint acceptance	37s
Validate Columnar 13	3m 8s
Validate Columnar 14	2m 56s
Validate Columnar 15	3m 7s
Validate Columnar 16	3m 3s
Build and Validate Postgres 13	4m 42s
Build and Validate Postgres 14	4m 49s
Build and Validate Spilo	0s
Build and Validate Postgres 15	4m 48s
Build and Validate Postgres 16	4m 50s
Push Spilo	0s
Benchmark Hydra Spilo image (${{ matrix.benchmark }})	0s
Push Postgres 13	1m 58s
Push Postgres 14	2m 6s
Push Postgres 15	1m 57s
Push Postgres 16	1m 57s
Benchmark Hydra Postgres image (warehouse-10G) / Run Benchmark	32m 19s
Benchmark Hydra Postgres image (clickbench-100M) / Run Benchmark	2h 1m 5s
	3h 13m 22s

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