BUG #15045: Partitioning not working as intended

The following bug has been logged on the website:

Bug reference: 15045
Logged by: Tomasz Kamiński
Email address: mlodikk(at)gmail(dot)com
PostgreSQL version: 10.1
Operating system: Centos 6
Description:

Hi,
i found something wrong with new partition mechanism in postgresql 10.1
I have table partitioned by time stored as epoch time. Each partition is one
month (my time is GMT+1).
I tried to make script, that's count rows from last month. I wrote something
like this:

SELECT count(*) FROM trends where
clock between (extract(epoch from (date_trunc ('month', CURRENT_DATE)-
interval '1 month')::date)::integer - 3600 )
and (extract(epoch from date_trunc ('month', CURRENT_DATE)::date)::integer -
3601 )

Problem is, that all partitions are scanned.
But when i write explicite values like this, only one partition is scaned as
intended:

SELECT count(*) FROM public.trends where
clock between 1514761200 and 1517439599

Bellow are my execution analyze plans, for both selects:

values from extract

[
{
"Execution Time": 3446.662,
"Planning Time": 4.129,
"Plan": {
"Partial Mode": "Finalize",
"Node Type": "Aggregate",
"Strategy": "Plain",
"Actual Total Time": 3426.528,
"Shared Hit Blocks": 10898,
"Plans": [
{
"Node Type": "Gather",
"Actual Total Time": 3426.521,
"Shared Hit Blocks": 10898,
"Plans": [
{
"Partial Mode": "Partial",
"Workers": [
{
"Shared Dirtied Blocks": 0,
"Actual Total Time": 3417.768,
"Shared Read Blocks": 11365,
"Local Written Blocks": 0,
"Actual Startup Time": 3417.768,
"Worker Number": 0,
"Temp Read Blocks": 0,
"Local Hit Blocks": 0,
"Actual Rows": 1,
"Shared Written Blocks": 0,
"Local Dirtied Blocks": 0,
"Temp Written Blocks": 0,
"Shared Hit Blocks": 10884,
"Local Read Blocks": 0,
"Actual Loops": 1
},
{
"Shared Dirtied Blocks": 0,
"Actual Total Time": 3417.768,
"Shared Read Blocks": 11354,
"Local Written Blocks": 0,
"Actual Startup Time": 3417.768,
"Worker Number": 1,
"Temp Read Blocks": 0,
"Local Hit Blocks": 0,
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"Shared Written Blocks": 0,
"Local Dirtied Blocks": 0,
"Temp Written Blocks": 0,
"Shared Hit Blocks": 10868,
"Local Read Blocks": 0,
"Actual Loops": 1
}
],
"Node Type": "Aggregate",
"Strategy": "Plain",
"Actual Total Time": 3419.766,
"Shared Hit Blocks": 32650,
"Plans": [
{
"Workers": [
{
"Shared Dirtied Blocks": 0,
"Actual Total Time": 3289.22,
"Shared Read Blocks": 11365,
"Local Written Blocks": 0,
"Actual Startup Time": 514.603,
"Worker Number": 0,
"Temp Read Blocks": 0,
"Local Hit Blocks": 0,
"Actual Rows": 1255242,
"Shared Written Blocks": 0,
"Local Dirtied Blocks": 0,
"Temp Written Blocks": 0,
"Shared Hit Blocks": 10884,
"Local Read Blocks": 0,
"Actual Loops": 1
},
{
"Shared Dirtied Blocks": 0,
"Actual Total Time": 3289.744,
"Shared Read Blocks": 11354,
"Local Written Blocks": 0,
"Actual Startup Time": 514.604,
"Worker Number": 1,
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"Local Hit Blocks": 0,
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"Actual Loops": 1
}
],
"Node Type": "Append",
"Actual Total Time": 3292.375,
"Shared Hit Blocks": 32650,
"Plans": [
{
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{
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{
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}
],
"Exact Heap Blocks": 0,
"Node Type": "Bitmap Heap Scan",
"Actual Total Time": 0.207,
"Shared Hit Blocks": 1,
"Schema": "public",
"Plans": [
{
"Node Type": "Bitmap Index Scan",
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"Plan Width": 0,
"Total Cost": 14.39,
"Actual Startup Time": 0.023,
"Temp Read Blocks": 0,
"Local Read Blocks": 0,
"Index Name":
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"Plan Rows": 5,
"Index Cond": "((trends_2017_08_older.clock >=
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(CURRENT_DATE)::timestamp with time zone) - '1
mon'::interval))::date)::timestamp without time zone))::integer - 3600)) AND
(trends_2017_08_older.clock <= ((date_part('epoch'::text,
((date_trunc('month'::text, (CURRENT_DATE)::timestamp with time
zone))::date)::timestamp without time zone))::integer - 3601)))",
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}
],
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"Relation Name": "trends_2017_08_older",
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"Temp Written Blocks": 0,
"Plan Width": 0,
"Total Cost": 22.97,
"Rows Removed by Index Recheck": 0,
"Lossy Heap Blocks": 0,
"Alias": "trends_2017_08_older",
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mon'::interval))::date)::timestamp without time zone))::integer - 3600)) AND
(trends_2017_08_older.clock <= ((date_part('epoch'::text,
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{
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(trends_2017_09.clock <= ((date_part('epoch'::text,
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}
],
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"Local Hit Blocks": 0,
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"Rows Removed by Index Recheck": 0,
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"Alias": "trends_2017_09",
"Recheck Cond": "((trends_2017_09.clock >=
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mon'::interval))::date)::timestamp without time zone))::integer - 3600)) AND
(trends_2017_09.clock <= ((date_part('epoch'::text,
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{
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