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There's now only one transition value and transition function. NULL handling in aggregates is a lot cleaner. Also, use Numeric accumulators instead of integer accumulators for sum/avg on integer datatypes --- this avoids overflow at the cost of being a little slower. Implement VARIANCE() and STDDEV() aggregates in the standard backend. Also, enable new LIKE selectivity estimators by default. Unrelated change, but as long as I had to force initdb anyway...
>From the servers perspective:
Receives StartupPacket
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(Is SSL_NEGOTIATE_CODE?) ----------- Normal startup
| No
|
| Yes
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(Server compiled with USE_SSL?) ------- Send 'N'
| No |
| |
| Yes Normal startup
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Send 'S'
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Establish SSL
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Normal startup
>From the clients perspective (v6.6 client _with_ SSL):
Connect
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Send packet with SSL_NEGOTIATE_CODE
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Receive single char ------- 'S' -------- Establish SSL
| |
| '<else>' |
| Normal startup
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Is it 'E' for error ------------------- Retry connection
| Yes without SSL
| No
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Is it 'N' for normal ------------------- Normal startup
| Yes
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Fail with unknown