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Added the TZ in Agg presentation

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Derick Rethans
2017-07-27 20:55:47 +01:00
parent 8a161b3425
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mongo-tz-in-3.6.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<presentation css="10gen-strict.css">
<topic>MongoDB</topic>
<title>Time Zone support in Aggregation</title>
<event>Drivers Meeting</event>
<location>online</location>
<date>July 27th, 2017</date>
<speaker>Derick Rethans</speaker>
<email>derick@mongodb.com</email>
<twitter>derickr</twitter>
<url>http://derickrethans.nl/talks.html</url>
<joindin></joindin>
<slide>slides/mongodb/title.xml</slide>
<slide>slides/mongodb/tz-in-agg-reason.xml</slide>
<slide>slides/mongodb/tz-in-agg-about-tz.xml</slide>
<slide>slides/time/problems-condensed.xml</slide>
<slide>slides/mongodb/tz-in-agg-how.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-extraction.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-to-string.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-from-string.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-from-string-with-tz.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-to-parts.xml</slide>
<slide>slides/mongodb/tz-in-agg-date-from-parts.xml</slide>
<slide>slides/mongodb/questions.xml</slide>
</presentation>

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<slide>
<title>What are time zones?</title>
<list>
<bullet>A set of rules indicating between which times which UTC offset is applicable</bullet>
<bullet>Indicated by a %Region%/%Area% identifier<br/>(like %Europe/Madrid%, or %America/Los_Angeles%)</bullet>
</list>
<break/>
<example>
derick@singlemalt:~ $ zdump -v Europe/Madrid
</example>
<example>
Mon Dec 31 23:59:59 1900 UT = Mon Dec 31 23:45:15 1900 LMT isdst=0 gmtoff=-884
Tue Jan 1 00:00:00 1901 UT = Tue Jan 1 00:00:00 1901 WET isdst=0 gmtoff=0
Mon Apr 15 22:59:59 1918 UT = Mon Apr 15 22:59:59 1918 WET isdst=0 gmtoff=0
Mon Apr 15 23:00:00 1918 UT = Tue Apr 16 00:00:00 1918 WEST isdst=1 gmtoff=3600
Sun Oct 6 23:59:59 1918 UT = Mon Oct 7 00:59:59 1918 WEST isdst=1 gmtoff=3600
Mon Oct 7 00:00:00 1918 UT = Mon Oct 7 00:00:00 1918 WET isdst=0 gmtoff=0
Sun Apr 6 22:59:59 1919 UT = Sun Apr 6 22:59:59 1919 WET isdst=0 gmtoff=0
...
Sun Oct 29 00:59:59 2017 UT = Sun Oct 29 02:59:59 2017 CEST isdst=1 gmtoff=7200
Sun Oct 29 01:00:00 2017 UT = Sun Oct 29 02:00:00 2017 CET isdst=0 gmtoff=3600
Sun Mar 25 00:59:59 2018 UT = Sun Mar 25 01:59:59 2018 CET isdst=0 gmtoff=3600
Sun Mar 25 01:00:00 2018 UT = Sun Mar 25 03:00:00 2018 CEST isdst=1 gmtoff=7200
Sun Oct 28 00:59:59 2018 UT = Sun Oct 28 02:59:59 2018 CEST isdst=1 gmtoff=7200
Sun Oct 28 01:00:00 2018 UT = Sun Oct 28 02:00:00 2018 CET isdst=0 gmtoff=3600
Sun Mar 31 00:59:59 2019 UT = Sun Mar 31 01:59:59 2019 CET isdst=0 gmtoff=3600
...
</example>
</slide>

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<slide>
<title>Date Extraction Operators</title>
<div effect="fade-out">
<blurb>In MongoDB 3.4:</blurb>
<!--
// Convert unix time stamp to ISODate
{ $project: { date: {
$dateFromString: {
dateString: {
$concat: [ '@', { $substr: [ '$createdAt', 0, -1 ] } ]
}
}
} } },
// Extract venue and hour
-->
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
venue: '$venue.name',
*hour: { $hour: '$date' }*
} }
] );
</example>
<example>
{ "venue" : "London Paddington Railway Station (PAD)", "hour" : 8 }
{ "venue" : "Platform 7 (Heathrow Express)", "hour" : 8 }
{ "venue" : "Heathrow Express Train - Paddington [PAD] to Heathrow [HXX]", "hour" : 8 }
{ "venue" : "SkyTeam Lounge", "hour" : 9 }
{ "venue" : "Gate 15", "hour" : 10 }
{ "venue" : "Gate D23", "hour" : 13 }
{ "venue" : "Amsterdam Airport Schiphol (AMS)", "hour" : 13 }
{ "venue" : "Station Amsterdam Lelylaan", "hour" : 13 }
{ "venue" : "Station Amsterdam Sloterdijk", "hour" : 13 }
{ "venue" : "Station Amsterdam Centraal", "hour" : 13 }
{ "venue" : "Burgermeester", "hour" : 16 }
{ "venue" : "De Eland", "hour" : 17 }
...
</example>
</div>
<div effect="fade-in-out">
<blurb>In MongoDB 3.6:</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
venue: '$venue.name',
hour: { $hour: *{ date: '$date' }* }
} }
] );
</example>
</div>
<div effect="fade-in">
<blurb>In MongoDB 3.6:</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
venue: '$venue.name',
hour: { $hour: { date: '$date', *timezone: 'Europe/London'* } }
} }
] );
</example>
<example>
{ "venue" : "London Paddington Railway Station (PAD)", "hour" : 9 }
{ "venue" : "Platform 7 (Heathrow Express)", "hour" : 9 }
{ "venue" : "Heathrow Express Train - Paddington [PAD] to Heathrow [HXX]", "hour" : 9 }
{ "venue" : "SkyTeam Lounge", "hour" : 10 }
{ "venue" : "Gate 15", "hour" : 11 }
{ "venue" : "Gate D23", "hour" : 14 }
{ "venue" : "Amsterdam Airport Schiphol (AMS)", "hour" : 14 }
{ "venue" : "Station Amsterdam Lelylaan", "hour" : 14 }
{ "venue" : "Station Amsterdam Sloterdijk", "hour" : 14 }
{ "venue" : "Station Amsterdam Centraal", "hour" : 14 }
{ "venue" : "Burgermeester", "hour" : 17 }
{ "venue" : "De Eland", "hour" : 18 }
{ "venue" : "WEBclusive HQ", "hour" : 12 }
{ "venue" : "Station Utrecht Centraal", "hour" : 17 }
...
</example>
</div>
</slide>

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<slide>
<title>New $dateFromParts operator</title>
<blurb>Creates an ISODate from parts + timezone</blurb>
<example inline="1">
db.tz.aggregate( [
{ $project: {
date: { *$dateFromParts*: {
'year': 2017, 'month': 2, 'day': 8, 'hour': 13, 'minute': 7,
'timezone': 'America/New_York'
} }
} }
] );
</example>
<blurb>
Which returns:
</blurb>
<example>
{ date: ISODate( "2017-02-08T18:07:00Z" ) }
</example>
</slide>

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<slide>
<title>New $dateFromString operator</title>
<div effect="fade-out">
<blurb>Convert integer (as Unix time stamp) to ISODate:</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: { date: {
$dateFromString: {
*dateString: {*
*$concat: [ '@', { $substr: [ '$createdAt', 0, -1 ] } ]*
*}*
}
} } },
] );
</example>
</div>
<div effect="fade-in-out">
<blurb>Expressed in a different time zone:</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
dateInLondon: {
$dateFromString: {
dateString: "2017-07-27 16:22:27.132",
*timezone: "Europe/London"*
}
}
} },
{ $limit: 1 }
] );
</example>
<example>
{ "dateInLondon" : ISODate("2017-07-27T15:22:27.132Z") }
</example>
</div>
<div effect="fade-in">
<blurb>Expressed in a different time zone:</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
dateInLondon: {
$dateFromString: {
dateString: "2017-07-27 16:22:27.132",
*timezone: "+01:00"*
}
}
} },
{ $limit: 1 }
] );
</example>
<example>
{ "dateInLondon" : ISODate("2017-07-27T15:22:27.132Z") }
</example>
</div>
</slide>

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<slide>
<title>New $dateFromString operator</title>
<blurb>Creating a date from a string</blurb>
<example inline="1">
db.foursquare.aggregate( [
{ $project: {
_id: 0,
may17th: { *$dateFromString: { dateString: "2017-05-17" }* },
july4th: { *$dateFromString: { dateString: "4/7/2017" }* },
nextWeekDay: { *$dateFromString: { dateString: "2017-07-27 next weekday" }* },
} },
{ $limit: 1 }
] );
</example>
<example>
{ "may17th" : ISODate("2017-05-17T00:00:00Z"),
"july4th" : ISODate("2017-04-07T00:00:00Z"),
"nextWeekDay" : ISODate("2017-07-28T00:00:00Z") }
</example>
</slide>

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<slide>
<title>New $dateToParts operator</title>
<blurb>Converts a date into its consituent parts.<br/><br/>A short cut for having to use a date extracting operator for each element:</blurb>
<div effect="fade-out">
<example inline="1">
db.cities.aggregate( [
{ $project: {
_id: 0,
blownUp: { *$dateToParts:* {
date: ISODate(),
timezone: "-04:30"
} }
} }
] );
</example>
<example>
{ "blownUp" : {
"year" : 2017, "month" : 7, "day" : 27,
"hour" : 11, "minute" : 3, "second" : 54, "millisecond" : 966
} }
</example>
</div>
<div effect="fade-in">
<example inline="1">
db.cities.aggregate( [
{ $project: {
_id: 0,
blownUp: { *$dateToParts:* {
date: ISODate(),
timezone: "-04:30",
*iso8601: true,*
} }
} }
] );
</example>
<example>
{ "blownUp" : {
"isoYear" : 2017, "isoWeekYear" : 30, "isoDayOfWeek" : 4,
"hour" : 11, "minute" : 6, "second" : 44, "millisecond" : 502
} }
</example>
</div>
</slide>

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<slide>
<title>Additions to $dateToString</title>
<example inline="1">
db.cities.aggregate( [
{ $match: { population: { $gte: 1000000 } } },
{ $sort: { population: -1 } },
{ $project: {
_id: 0,
name: '$name',
time: {
*$dateToString:* {
date: ISODate(),
format: '\%Y-\%m-\%d \%H:\%M:\%S *%z*',
*timezone: '$timezone'*
}
}
} }
] );
</example>
<example>{ "name" : "Shanghai", "time" : "2017-07-27 22:49:24 +0800" }
{ "name" : "Buenos Aires", "time" : "2017-07-27 11:49:24 -0300" }
{ "name" : "Mumbai", "time" : "2017-07-27 20:19:24 +0530" }
{ "name" : "Mexico City", "time" : "2017-07-27 09:49:24 -0500" }
{ "name" : "Karachi", "time" : "2017-07-27 19:49:24 +0500" }
{ "name" : "İstanbul", "time" : "2017-07-27 17:49:24 +0300" }
…
</example>
</slide>

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<slide>
<title>How?</title>
<list>
<bullet>Vendorize a library: %timelib%</bullet>
<bullet>DST calculations, parsing, etc.</bullet>
<bullet>Also used in PHP and HHVM</bullet>
<bullet>Comes with built-in database,<br/>but also: %/usr/share/zoneinfo% and archive</bullet>
<bullet>%processManagement.timeZoneInfo%</bullet>
</list>
<break/>
<list>
<bullet>Project as part of the Server-Query team</bullet>
</list>
</slide>

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<slide>
<title>Why?</title>
<list>
<bullet>MongoDB stores date information solely as a Unix time stamp</bullet>
<bullet>Microseconds since 1970-01-01 00:00 UTC</bullet>
<bullet>No way to do a group-by-day in any other time zone without hacks</bullet>
<bullet>Can't output in anything else besides UTC</bullet>
</list>
</slide>