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Date difference returns month_interval instead of day_interval #3917

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monetdb-team opened this issue Nov 30, 2020 · 0 comments
Closed

Date difference returns month_interval instead of day_interval #3917

monetdb-team opened this issue Nov 30, 2020 · 0 comments

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@monetdb-team
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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2016-02-04 15:36:08 +0100
From: @swingbit
To: SQL devs <>
Version: 11.19.9 (Oct2014-SP2)
CC: @njnes

Last updated: 2016-03-25 09:59:19 +0100

Comment 21768

Date: 2016-02-04 15:36:08 +0100
From: @swingbit

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36
Build Identifier:

Casting the result of a date difference to double:

sql>select cast ( cast('2016-01-01' as date) - cast('2015-01-01' as date) as double);
types month_interval(32,0) and double(53,0) are not equal

  1. https://www.monetdb.org/Documentation/SQLreference/Temporal mentions:
    "For difference calculations between dates (in numbers of days) we use signed integer."
    However it seems that month_interval is used.

  2. No matter if you use month or day interval, why is a cast to double not possible? First casting to integer and then to double does work (see below). Is upcasting not working transitively?

sql>select cast ( cast ( cast('2016-01-01' as date) - cast('2015-01-01' as date) as int) as double);
+--------------------------+
| L4 |
+==========================+
| 365 |
+--------------------------+

Reproducible: Always

$ mserver5 --version
MonetDB 5 server v11.21.14 (64-bit, 64-bit oids, 128-bit integers)
This is an unreleased version
Copyright (c) 1993-July 2008 CWI
Copyright (c) August 2008-2015 MonetDB B.V., all rights reserved
Visit http://www.monetdb.org/ for further information
Found 15.6GiB available memory, 8 available cpu cores
Libraries:
libpcre: 8.37 2015-04-28 (compiled with 8.37)
openssl: OpenSSL 1.0.1k 8 Jan 2015 (compiled with OpenSSL 1.0.1k-fips 8 Jan 2015)
libxml2: 2.9.3 (compiled with 2.9.3)
Compiled by: roberto@photon.hq.spinque.com (x86_64-unknown-linux-gnu)
Compilation: gcc -O3 -pipe -Werror -Wall -Wextra -W -Werror-implicit-function-declaration -Wpointer-arith -Wdeclaration-after-statement -Wundef -Wformat=2 -Wno-format-nonliteral -Winit-self -Winvalid-pch -Wmissing-declarations -Wmissing-format-attribute -Wmissing-prototypes -Wold-style-definition -Wpacked -Wunknown-pragmas -Wvariadic-macros -fstack-protector-all -Wstack-protector -Wpacked-bitfield-compat -Wsync-nand -Wjump-misses-init -Wmissing-include-dirs -Wlogical-op -Wunreachable-code -D_FORTIFY_SOURCE=2
Linking : /usr/bin/ld -m elf_x86_64

Comment 21889

Date: 2016-03-13 20:10:59 +0100
From: @njnes

was fixed in the 2015 branch

Comment 21960

Date: 2016-03-25 09:59:19 +0100
From: @sjoerdmullender

Jul2015-SP3 has been released.

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