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Re: Jsonb extraction very slow

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Please CC the list.

On 8/11/16 2:19 AM, hari.prasath wrote:
Actually I've done some testing with this and there is a *significant*
overhead in getting multiple keys from a large document. There's a
significant extra cost for the first key, but there's also a non-trivial
cost for every key after that.

Why is it take some extra cost for the first key and less for keys after
that.?
Is there any specific reason for this.? if so please explain..

I never dug into why. As Tom posited, decompression might explain the time to get a single key out. Getting 10 keys instead of just 1 wasn't 10x more expensive, but it was significantly more expensive than just getting a single key.
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