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Simplify columnar perf example (#6526) 

Rewrite the plpython function to generate random words in SQL to
simplify the usage and run the example.
pull/6533/head
Fabrízio de Royes Mello 2022-12-01 16:05:40 -03:00 committed by GitHub
parent 29f0196fdf
commit 37f3dff1ca
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1 changed files with 8 additions and 10 deletions
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18
src/backend/columnar/README.md
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@ -234,16 +234,14 @@ CREATE TABLE perf_columnar(LIKE perf_row) USING COLUMNAR;
## Data
```sql
CREATE OR REPLACE FUNCTION random_words(n INT4) RETURNS TEXT LANGUAGE plpython2u AS $$
import random
t = ''
words = ['zero','one','two','three','four','five','six','seven','eight','nine','ten']
for i in xrange(0,n):
if (i != 0):
t += ' '
r = random.randint(0,len(words)-1)
t += words[r]
return t
CREATE OR REPLACE FUNCTION random_words(n INT4) RETURNS TEXT LANGUAGE sql AS $$
WITH words(w) AS (
SELECT ARRAY['zero','one','two','three','four','five','six','seven','eight','nine','ten']
),
random (word) AS (
SELECT w[(random()*array_length(w, 1))::int] FROM generate_series(1, $1) AS i, words
)
SELECT string_agg(word, ' ') FROM random;
$$;
```