雪花中的 JavaScript UDF
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【中文标题】雪花中的 JavaScript UDF【英文标题】：JavaScript UDF in Snowflake 【发布时间】：2018-10-08 13:38:14 【问题描述】：我正在尝试使用 Snowflake 中的 date.js 函数。
我已在 Snowflake 中将其配置为作为 UDF 工作，但是，当我在从多于 1 行的表中进行选择时使用该函数时出现递归错误。
javascript 执行错误：未捕获的 RangeError：在“Date.prototype._toString=Date.prototype.toString;Date.prototype.toString=function(format)”位置 82 处的 DATEJS 中超出了最大调用堆栈大小堆栈跟踪：DATEJS.Date .toString 行：199 DATEJS.Date.toString 行：228 DATEJS.Date.toString 行：228...[snip]
这是代码：
CREATE OR REPLACE FUNCTION datejs (datein string)
RETURNS string
LANGUAGE JAVASCRIPT
AS '
var dateIn = DATEIN;
/**
* [Copyright info snipped]
*/
Date.CultureInfo=
name:"en-US",englishName:"English (United States)",nativeName:"English (United States)",
dayNames:["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],
abbreviatedDayNames:["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],
shortestDayNames:["Su","Mo","Tu","We","Th","Fr","Sa"],
firstLetterDayNames:["S","M","T","W","T","F","S"],
monthNames:["January","February","March","April","May","June","July","August","September","October","November","December"],
abbreviatedMonthNames:["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],
amDesignator:"AM",pmDesignator:"PM",firstDayOfWeek:0,twoDigitYearMax:2029,dateElementOrder:"mdy",
formatPatterns:
shortDate:"M/d/yyyy",longDate:"dddd, MMMM dd, yyyy",shortTime:"h:mm tt",longTime:"h:mm:ss tt",
fullDateTime:"dddd, MMMM dd, yyyy h:mm:ss tt",sortableDateTime:"yyyy-MM-ddTHH:mm:ss",
universalSortableDateTime:"yyyy-MM-dd HH:mm:ssZ",rfc1123:"ddd, dd MMM yyyy HH:mm:ss GMT",
monthDay:"MMMM dd",yearMonth:"MMMM, yyyy",
regexPatterns:
jan:/^jan(uary)?/i,feb:/^feb(ruary)?/i,mar:/^mar(ch)?/i,apr:/^apr(il)?/i,may:/^may/i,jun:/^jun(e)?/i,jul:/^jul(y)?/i,
aug:/^aug(ust)?/i,sep:/^sep(t(ember)?)?/i,oct:/^oct(ober)?/i,nov:/^nov(ember)?/i,dec:/^dec(ember)?/i,
sun:/^su(n(day)?)?/i,mon:/^mo(n(day)?)?/i,tue:/^tu(e(s(day)?)?)?/i,wed:/^we(d(nesday)?)?/i,thu:/^th(u(r(s(day)?)?)?)?/i,fri:/^fr(i(day)?)?/i,sat:/^sa(t(urday)?)?/i,
future:/^next/i,past:/^last|past|prev(ious)?/i,add:/^(\\+|after|from)/i,subtract:/^(\\-|before|ago)/i,yesterday:/^yesterday/i,today:/^t(oday)?/i,
tomorrow:/^tomorrow/i,now:/^n(ow)?/i,millisecond:/^ms|milli(second)?s?/i,second:/^sec(ond)?s?/i,minute:/^min(ute)?s?/i,
hour:/^h(ou)?rs?/i,week:/^w(ee)?k/i,month:/^m(o(nth)?s?)?/i,day:/^d(ays?)?/i,year:/^y((ea)?rs?)?/i,shortMeridian:/^(a|p)/i,
longMeridian:/^(a\\.?m?\\.?|p\\.?m?\\.?)/i,timezone:/^((e(s|d)t|c(s|d)t|m(s|d)t|p(s|d)t)|((gmt)?\\s*(\\+|\\-)\\s*\\d\d\\d\\d?)|gmt)/i,
ordinalSuffix:/^\\s*(st|nd|rd|th)/i,timeContext:/^\\s*(\\:|a|p)/i
,
abbreviatedTimeZoneStandard:GMT:"-000",EST:"-0400",CST:"-0500",MST:"-0600",PST:"-0700",
abbreviatedTimeZoneDST:GMT:"-000",EDT:"-0500",CDT:"-0600",MDT:"-0700",PDT:"-0800"
;
Date.getMonthNumberFromName=function(name)
var n=Date.CultureInfo.monthNames,
m=Date.CultureInfo.abbreviatedMonthNames,
s=name.toLowerCase();
for(var i=0;i<n.length;i++)if(n[i].toLowerCase()==s||m[i].toLowerCase()==s)return i;
return-1;
;
Date.getDayNumberFromName=function(name)
var n=Date.CultureInfo.dayNames,
m=Date.CultureInfo.abbreviatedDayNames,
o=Date.CultureInfo.shortestDayNames,
s=name.toLowerCase();
for(var i=0;i<n.length;i++)
if(n[i].toLowerCase()==s||m[i].toLowerCase()==s)return i;
return-1;
;
Date.isLeapYear=function(year)return(((year%4===0)&&(year%100!==0))||(year%400===0));;
Date.getDaysInMonth=function(year,month)return[31,(Date.isLeapYear(year)?29:28),31,30,31,30,31,31,30,31,30,31][month];;
Date.getTimezoneOffset=function(s,dst)return(dst||false)?Date.CultureInfo.abbreviatedTimeZoneDST[s.toUpperCase()]:Date.CultureInfo.abbreviatedTimeZoneStandard[s.toUpperCase()];;
Date.getTimezoneAbbreviation=function(offset,dst)
var n=(dst||false)?Date.CultureInfo.abbreviatedTimeZoneDST:Date.CultureInfo.abbreviatedTimeZoneStandard,p;
for(p in n)if(n[p]===offset)return p;
return null;
;
Date.prototype.clone=function()return new Date(this.getTime());;
Date.prototype.compareTo=function(date)
if(isNaN(this))throw new Error(this);
if(date instanceof Date&&!isNaN(date))return(this>date)?1:(this<date)?-1:0;
elsethrow new TypeError(date);
;
Date.prototype.equals=function(date)return(this.compareTo(date)===0);;
Date.prototype.between=function(start,end)var t=this.getTime();return t>=start.getTime()&&t<=end.getTime();;
Date.prototype.addMilliseconds=function(value)this.setMilliseconds(this.getMilliseconds()+value);return this;;
Date.prototype.addSeconds=function(value)return this.addMilliseconds(value*1000);;
Date.prototype.addMinutes=function(value)return this.addMilliseconds(value*60000);;
Date.prototype.addHours=function(value)return this.addMilliseconds(value*3600000);;
Date.prototype.addDays=function(value)return this.addMilliseconds(value*86400000);;
Date.prototype.addWeeks=function(value)return this.addMilliseconds(value*604800000);;
Date.prototype.addMonths=function(value)var n=this.getDate();this.setDate(1);this.setMonth(this.getMonth()+value);this.setDate(Math.min(n,this.getDaysInMonth()));return this;;
Date.prototype.addYears=function(value)return this.addMonths(value*12);;
Date.prototype.add=function(config)
if(typeof config=="number")this._orient=config;return this;
var x=config;if(x.millisecond||x.milliseconds)this.addMilliseconds(x.millisecond||x.milliseconds);
if(x.second||x.seconds)this.addSeconds(x.second||x.seconds);
if(x.minute||x.minutes)this.addMinutes(x.minute||x.minutes);
if(x.hour||x.hours)this.addHours(x.hour||x.hours);
if(x.month||x.months)this.addMonths(x.month||x.months);
if(x.year||x.years)this.addYears(x.year||x.years);
if(x.day||x.days)this.addDays(x.day||x.days);
return this;
;
Date._validate=function(value,min,max,name)
if(typeof value!="number")throw new TypeError(value+" is not a Number.");
else if(value<min||value>max)throw new RangeError(value+" is not a valid value for "+name+".");
return true;
;
Date.validateMillisecond=function(n)return Date._validate(n,0,999,"milliseconds");;
Date.validateSecond=function(n)return Date._validate(n,0,59,"seconds");;
Date.validateMinute=function(n)return Date._validate(n,0,59,"minutes");;
Date.validateHour=function(n)return Date._validate(n,0,23,"hours");;
Date.validateDay=function(n,year,month)return Date._validate(n,1,Date.getDaysInMonth(year,month),"days");;
Date.validateMonth=function(n)return Date._validate(n,0,11,"months");;
Date.validateYear=function(n)return Date._validate(n,1,9999,"seconds");;
Date.prototype.set=function(config)
var x=config;
if(!x.millisecond&&x.millisecond!==0)x.millisecond=-1;
if(!x.second&&x.second!==0)x.second=-1;
if(!x.minute&&x.minute!==0)x.minute=-1;
if(!x.hour&&x.hour!==0)x.hour=-1;
if(!x.day&&x.day!==0)x.day=-1;
if(!x.month&&x.month!==0)x.month=-1;
if(!x.year&&x.year!==0)x.year=-1;
if(x.millisecond!=-1&&Date.validateMillisecond(x.millisecond))this.addMilliseconds(x.millisecond-this.getMilliseconds());
if(x.second!=-1&&Date.validateSecond(x.second))this.addSeconds(x.second-this.getSeconds());
if(x.minute!=-1&&Date.validateMinute(x.minute))this.addMinutes(x.minute-this.getMinutes());
if(x.hour!=-1&&Date.validateHour(x.hour))this.addHours(x.hour-this.getHours());
if(x.month!==-1&&Date.validateMonth(x.month))this.addMonths(x.month-this.getMonth());
if(x.year!=-1&&Date.validateYear(x.year))this.addYears(x.year-this.getFullYear());
if(x.day!=-1&&Date.validateDay(x.day,this.getFullYear(),this.getMonth()))this.addDays(x.day-this.getDate());
if(x.timezone)this.setTimezone(x.timezone);
if(x.timezoneOffset)this.setTimezoneOffset(x.timezoneOffset);
return this;
;
Date.prototype.clearTime=function()this.setHours(0);this.setMinutes(0);this.setSeconds(0);this.setMilliseconds(0);return this;;
Date.prototype.isLeapYear=function()var y=this.getFullYear();return(((y%4===0)&&(y%100!==0))||(y%400===0));;
Date.prototype.isWeekday=function()return!(this.is().sat()||this.is().sun());;
Date.prototype.getDaysInMonth=function()return Date.getDaysInMonth(this.getFullYear(),this.getMonth());;
Date.prototype.moveToFirstDayOfMonth=function()return this.set(day:1);;
Date.prototype.moveToLastDayOfMonth=function()return this.set(day:this.getDaysInMonth());;
Date.prototype.moveToDayOfWeek=function(day,orient)var diff=(day-this.getDay()+7*(orient||+1))%7;return this.addDays((diff===0)?diff+=7*(orient||+1):diff);;
Date.prototype.moveToMonth=function(month,orient)var diff=(month-this.getMonth()+12*(orient||+1))%12;return this.addMonths((diff===0)?diff+=12*(orient||+1):diff);;
Date.prototype.getDayOfYear=function()return Math.floor((this-new Date(this.getFullYear(),0,1))/86400000);;
Date.prototype.getWeekOfYear=function(firstDayOfWeek)
var y=this.getFullYear(),
m=this.getMonth(),
d=this.getDate();
var dow=firstDayOfWeek||Date.CultureInfo.firstDayOfWeek;
var offset=7+1-new Date(y,0,1).getDay();
if(offset==8)offset=1;
var daynum=((Date.UTC(y,m,d,0,0,0)-Date.UTC(y,0,1,0,0,0))/86400000)+1;
var w=Math.floor((daynum-offset+7)/7);
if(w===dow)y--;var prevOffset=7+1-new Date(y,0,1).getDay();
if(prevOffset==2||prevOffset==8)w=53;elsew=52;
return w;
;
Date.prototype.isDST=function()console.log("isDST");return this.toString().match(/(E|C|M|P)(S|D)T/)[2]=="D";;
Date.prototype.getTimezone=function()return Date.getTimezoneAbbreviation(this.getUTCOffset,this.isDST());;
Date.prototype.setTimezoneOffset=function(s)var here=this.getTimezoneOffset(),there=Number(s)*-6/10;this.addMinutes(there-here);return this;;
Date.prototype.setTimezone=function(s)return this.setTimezoneOffset(Date.getTimezoneOffset(s));;
Date.prototype.getUTCOffset=function()var n=this.getTimezoneOffset()*-10/6,r;if(n<0)r=(n-10000).toString();return r[0]+r.substr(2);elser=(n+10000).toString();return"+"+r.substr(1);;
Date.prototype.getDayName=function(abbrev)return abbrev?Date.CultureInfo.abbreviatedDayNames[this.getDay()]:Date.CultureInfo.dayNames[this.getDay()];;
Date.prototype.getMonthName=function(abbrev)return abbrev?Date.CultureInfo.abbreviatedMonthNames[this.getMonth()]:Date.CultureInfo.monthNames[this.getMonth()];;
Date.prototype._toString=Date.prototype.toString;
Date.prototype.toString=function(format)
var self=this;
var p=function p(s)
return(s.toString().length==1)?"0"+s:s;;
return format?format.replace(
/dd?d?d?|MM?M?M?|yy?y?y?|hh?|HH?|mm?|ss?|tt?|zz?z?/g,
function(format)
switch(format)
case"hh":return p(self.getHours()<13?self.getHours():(self.getHours()-12));
case"h":return self.getHours()<13?self.getHours():(self.getHours()-12);
case"HH":return p(self.getHours());
case"H":return self.getHours();
case"mm":return p(self.getMinutes());
case"m":return self.getMinutes();
case"ss":return p(self.getSeconds());
case"s":return self.getSeconds();
case"yyyy":return self.getFullYear();
case"yy":return self.getFullYear().toString().substring(2,4);
case"dddd":return self.getDayName();
case"ddd":return self.getDayName(true);
case"dd":return p(self.getDate());
case"d":return self.getDate().toString();
case"MMMM":return self.getMonthName();
case"MMM":return self.getMonthName(true);
case"MM":return p((self.getMonth()+1));
case"M":return self.getMonth()+1;
case"t":return self.getHours()<12?Date.CultureInfo.amDesignator.substring(0,1):Date.CultureInfo.pmDesignator.substring(0,1);
case"tt":return self.getHours()<12?Date.CultureInfo.amDesignator:Date.CultureInfo.pmDesignator;
case"zzz":case"zz":case"z":return"";
):this._toString();
;
Date.now=function()return new Date();;
Date.today=function()return Date.now().clearTime();;
Date.prototype._orient=+1;Date.prototype.next=function()this._orient=+1;return this;;
Date.prototype.last=Date.prototype.prev=Date.prototype.previous=function()this._orient=-1;return this;;
Date.prototype._is=false;
Date.prototype.is=function()this._is=true;return this;;
Number.prototype._dateElement="day";Number.prototype.fromNow=function()var c=;c[this._dateElement]=this;return Date.now().add(c);;
Number.prototype.ago=function()var c=;c[this._dateElement]=this*-1;return Date.now().add(c);;
(function()
var $D=Date.prototype,$N=Number.prototype;
var dx=("sunday monday tuesday wednesday thursday friday saturday").split(/\\s/),
mx=("january february march april may june july august september october november december").split(/\\s/),
px=("Millisecond Second Minute Hour Day Week Month Year").split(/\\s/),de;
var df=function(n)
return function()
if(this._is)this._is=false;return this.getDay()==n;
return this.moveToDayOfWeek(n,this._orient);
;
;
for(var i=0;i<dx.length;i++)$D[dx[i]]=$D[dx[i].substring(0,3)]=df(i);
var mf=function(n)
return function()
if(this._is)this._is=false;return this.getMonth()===n;
return this.moveToMonth(n,this._orient);
;
;
for(var j=0;j<mx.length;j++)$D[mx[j]]=$D[mx[j].substring(0,3)]=mf(j);
var ef=function(j)
return function()
if(j.substring(j.length-1)!="s")j+="s";
return this["add"+j](this._orient);
;
;
var nf=function(n)return function()this._dateElement=n;return this;;;
for(var k=0;k<px.length;k++)de=px[k].toLowerCase();$D[de]=$D[de+"s"]=ef(px[k]);$N[de]=$N[de+"s"]=nf(de);
());
Date.prototype.toJSONString=function()return this.toString("yyyy-MM-ddThh:mm:ssZ");;
Date.prototype.toShortDateString=function()return this.toString(Date.CultureInfo.formatPatterns.shortDatePattern);;
Date.prototype.toLongDateString=function()return this.toString(Date.CultureInfo.formatPatterns.longDatePattern);;
Date.prototype.toShortTimeString=function()return this.toString(Date.CultureInfo.formatPatterns.shortTimePattern);;
Date.prototype.toLongTimeString=function()return this.toString(Date.CultureInfo.formatPatterns.longTimePattern);;
Date.prototype.getOrdinal=function()switch(this.getDate())case 1:case 21:case 31:return"st";case 2:case 22:return"nd";case 3:case 23:return"rd";default:return"th";;
(function()
Date.Parsing=
Exception:function(s)this.message="Parse error at \'"+s.substring(0,10)+" ...\'";
;
var $P=Date.Parsing;
var _=$P.Operators=
rtoken:function(r)
return function(s)
var mx=s.match(r);
if(mx)return([mx[0],s.substring(mx[0].length)]);
elsethrow new $P.Exception(s);
;
,
token:function(s)return function(s)return _.rtoken(new RegExp("^\\s*"+s+"\\s*"))(s);;,
stoken:function(s)return _.rtoken(new RegExp("^"+s));,
until:function(p)return function(s)var qx=[],rx=null;while(s.length)
tryrx=p.call(this,s);
catch(e)qx.push(rx[0]);s=rx[1];continue;
break;
return[qx,s];;,many:function(p)
return function(s)var rx=[],r=null;while(s.length)
tryr=p.call(this,s);catch(e)return[rx,s];
rx.push(r[0]);s=r[1];
return[rx,s];;
,
optional:function(p)
return function(s)var r=null;tryr=p.call(this,s);catch(e)return[null,s];
return[r[0],r[1]];;
,
not:function(p)
return function(s)
tryp.call(this,s);
catch(e)return[null,s];
throw new $P.Exception(s);
;
,
ignore:function(p)return p?function(s)var r=null;r=p.call(this,s);return[null,r[1]];:null;,
product:function()
var px=arguments[0],qx=Array.prototype.slice.call(arguments,1),rx=[];
for(var i=0;i<px.length;i++)rx.push(_.each(px[i],qx));
return rx;
,
cache:function(rule)
var cache=,r=null;
return function(s)
tryr=cache[s]=(cache[s]||rule.call(this,s));
catch(e)r=cache[s]=e;
if(r instanceof $P.Exception)throw r;elsereturn r;
;
,
any:function()
var px=arguments;
return function(s)
var r=null;for(var i=0;i<px.length;i++)
if(px[i]==null)continue;
tryr=(px[i].call(this,s));
catch(e)r=null;
if(r)return r;
throw new $P.Exception(s);
;
,
each:function()
var px=arguments;
return function(s)
var rx=[],r=null;for(var i=0;i<px.length;i++)
if(px[i]==null)continue;
tryr=(px[i].call(this,s));
catch(e)throw new $P.Exception(s);
rx.push(r[0]);s=r[1];
return[rx,s];
;
,
all:function()var px=arguments,_=_;return _.each(_.optional(px));,
sequence:function(px,d,c)
d=d||_.rtoken(/^\\s*/);c=c||null;
if(px.length==1)return px[0];
return function(s)
var r=null,q=null;
var rx=[];
for(var i=0;i<px.length;i++)
tryr=px[i].call(this,s);
catch(e)break;
rx.push(r[0]);
tryq=d.call(this,r[1]);
catch(ex)q=null;break;
s=q[1];
if(!r)throw new $P.Exception(s);
if(q)throw new $P.Exception(q[1]);
if(c)tryr=c.call(this,r[1]);catch(ey)throw new $P.Exception(r[1]);
return[rx,(r?r[1]:s)];
;
,
between:function(d1,p,d2)
d2=d2||d1;
var _fn=_.each(_.ignore(d1),p,_.ignore(d2));
return function(s)var rx=_fn.call(this,s);
return[[rx[0][0],r[0][2]],rx[1]];;
,
list:function(p,d,c)
d=d||_.rtoken(/^\\s*/);c=c||null;
return(p instanceof Array?_.each(_.product(p.slice(0,-1),_.ignore(d)),p.slice(-1),_.ignore(c)):_.each(_.many(_.each(p,_.ignore(d))),px,_.ignore(c)));
,
set:function(px,d,c)
d=d||_.rtoken(/^\\s*/);c=c||null;
return function(s)
var r=null,p=null,q=null,rx=null,best=[[],s],last=false;
for(var i=0;i<px.length;i++)
q=null;p=null;r=null;last=(px.length==1);
tryr=px[i].call(this,s);
catch(e)continue;
rx=[[r[0]],r[1]];if(r[1].length>0&&!last)tryq=d.call(this,r[1]);catch(ex)last=true;elselast=true;
if(!last&&q[1].length===0)last=true;
if(!last)
var qx=[];
for(var j=0;j<px.length;j++)if(i!=j)qx.push(px[j]);
p=_.set(qx,d).call(this,q[1]);
if(p[0].length>0)rx[0]=rx[0].concat(p[0]);rx[1]=p[1];
if(rx[1].length<best[1].length)best=rx;
if(best[1].length===0)break;
if(best[0].length===0)return best;
if(c)
tryq=c.call(this,best[1]);
catch(ey)throw new $P.Exception(best[1]);
best[1]=q[1];
return best;
;
,
forward:function(gr,fname)return function(s)return gr[fname].call(this,s);;,
replace:function(rule,repl)return function(s)var r=rule.call(this,s);return[repl,r[1]];;,
process:function(rule,fn)return function(s)var r=rule.call(this,s);return[fn.call(this,r[0]),r[1]];;,
min:function(min,rule)
return function(s)var rx=rule.call(this,s);if(rx[0].length<min)throw new $P.Exception(s);
return rx;;
;
var _generator=function(op)
return function()
var args=null,rx=[];
if(arguments.length>1)args=Array.prototype.slice.call(arguments);
else if(arguments[0]instanceof Array)args=arguments[0];
if(args)
for(var i=0,px=args.shift();i<px.length;i++)args.unshift(px[i]);rx.push(op.apply(null,args));args.shift();return rx;
elsereturn op.apply(null,arguments);
;
;
var gx="optional not ignore cache".split(/\\s/);
for(var i=0;i<gx.length;i++)_[gx[i]]=_generator(_[gx[i]]);
var _vector=function(op)
return function()if(arguments[0]instanceof Array)return op.apply(null,arguments[0]);elsereturn op.apply(null,arguments);;
;
var vx="each any all".split(/\\s/);
for(var j=0;j<vx.length;j++)_[vx[j]]=_vector(_[vx[j]]);
());
(function()
var flattenAndCompact=function(ax)
var rx=[];
for(var i=0;i<ax.length;i++)
if(ax[i]instanceof Array)rx=rx.concat(flattenAndCompact(ax[i]));
elseif(ax[i])rx.push(ax[i]);
return rx;
;
Date.Grammar=;
Date.Translator=
hour:function(s)return function()this.hour=Number(s);;,
minute:function(s)return function()this.minute=Number(s);;,
second:function(s)return function()this.second=Number(s);;,
meridian:function(s)return function()this.meridian=s.slice(0,1).toLowerCase();;,
timezone:function(s)
return function()
var n=s.replace(/[^\\d\\+\\-]/g,"");
if(n.length)this.timezoneOffset=Number(n);
elsethis.timezone=s.toLowerCase();
;
,
day:function(x)var s=x[0];return function()this.day=Number(s.match(/\\d+/)[0]);;,
month:function(s)return function()this.month=((s.length==3)?Date.getMonthNumberFromName(s):(Number(s)-1));;,
year:function(s)return function()var n=Number(s);this.year=((s.length>2)?n:(n+(((n+2000)<Date.CultureInfo.twoDigitYearMax)?2000:1900)));;,
rday:function(s)return function()switch(s)case"yesterday":this.days=-1;break;case"tomorrow":this.days=1;break;case"today":this.days=0;break;case"now":this.days=0;this.now=true;break;;,
finishExact:function(x)
x=(x instanceof Array)?x:[x];var now=new Date();
this.year=now.getFullYear();
this.month=now.getMonth();
this.day=1;
this.hour=0;
this.minute=0;
this.second=0;
for(var i=0;i<x.length;i++)if(x[i])x[i].call(this);
this.hour=(this.meridian=="p"&&this.hour<13)?this.hour+12:this.hour;
if(this.day>Date.getDaysInMonth(this.year,this.month))
throw new RangeError(this.day+" is not a valid value for days.");
var r=new Date(this.year,this.month,this.day,this.hour,this.minute,this.second);
if(this.timezone)r.set(timezone:this.timezone);
else if(this.timezoneOffset)r.set(timezoneOffset:this.timezoneOffset);
return r;
,
finish:function(x)
x=(x instanceof Array)?flattenAndCompact(x):[x];if(x.length===0)return null;
for(var i=0;i<x.length;i++)if(typeof x[i]=="function")x[i].call(this);
if(this.now)return new Date();
var today=Date.today();
var method=null;
var expression=!!(this.days!=null||this.orient||this.operator);
if(expression)
var gap,mod,orient;orient=((this.orient=="past"||this.operator=="subtract")?-1:1);
if(this.weekday)this.unit="day";gap=(Date.getDayNumberFromName(this.weekday)-today.getDay());mod=7;this.days=gap?((gap+(orient*mod))%mod):(orient*mod);
if(this.month)this.unit="month";gap=(this.month-today.getMonth());mod=12;this.months=gap?((gap+(orient*mod))%mod):(orient*mod);this.month=null;
if(!this.unit)this.unit="day";
if(this[this.unit+"s"]==null||this.operator!=null)
if(!this.value)this.value=1;
if(this.unit=="week")this.unit="day";this.value=this.value*7;
this[this.unit+"s"]=this.value*orient;
return today.add(this);
else
if(this.meridian&&this.hour)this.hour=(this.hour<13&&this.meridian=="p")?this.hour+12:this.hour;
if(this.weekday&&!this.day)this.day=(today.addDays((Date.getDayNumberFromName(this.weekday)-today.getDay()))).getDate();
if(this.month&&!this.day)this.day=1;
return today.set(this);
;
var _=Date.Parsing.Operators,
g=Date.Grammar,
t=Date.Translator,_fn;
g.datePartDelimiter=_.rtoken(/^([\\s\\-\\.\\,\\/\\x27]+)/);
g.timePartDelimiter=_.stoken(":");
g.whiteSpace=_.rtoken(/^\\s*/);
g.generalDelimiter=_.rtoken(/^(([\\s\\,]|at|on)+)/);
var _C=;
g.ctoken=function(keys)
var fn=_C[keys];if(!fn)
var c=Date.CultureInfo.regexPatterns;
var kx=keys.split(/\\s+/),px=[];
for(var i=0;i<kx.length;i++)px.push(_.replace(_.rtoken(c[kx[i]]),kx[i]));
fn=_C[keys]=_.any.apply(null,px);
return fn;
;
g.ctoken2=function(key)return _.rtoken(Date.CultureInfo.regexPatterns[key]);;
g.h=_.cache(_.process(_.rtoken(/^(0[0-9]|1[0-2]|[1-9])/),t.hour));
g.hh=_.cache(_.process(_.rtoken(/^(0[0-9]|1[0-2])/),t.hour));
g.H=_.cache(_.process(_.rtoken(/^([0-1][0-9]|2[0-3]|[0-9])/),t.hour));
g.HH=_.cache(_.process(_.rtoken(/^([0-1][0-9]|2[0-3])/),t.hour));
g.m=_.cache(_.process(_.rtoken(/^([0-5][0-9]|[0-9])/),t.minute));
g.mm=_.cache(_.process(_.rtoken(/^[0-5][0-9]/),t.minute));
g.s=_.cache(_.process(_.rtoken(/^([0-5][0-9]|[0-9])/),t.second));
g.ss=_.cache(_.process(_.rtoken(/^[0-5][0-9]/),t.second));
g.hms=_.cache(_.sequence([g.H,g.mm,g.ss],g.timePartDelimiter));
g.t=_.cache(_.process(g.ctoken2("shortMeridian"),t.meridian));
g.tt=_.cache(_.process(g.ctoken2("longMeridian"),t.meridian));
g.z=_.cache(_.process(_.rtoken(/^(\\+|\\-)?\\s*\\d\\d\d\\d?/),t.timezone));
g.zz=_.cache(_.process(_.rtoken(/^(\\+|\\-)\\s*\\d\\d\\d\\d/),t.timezone));
g.zzz=_.cache(_.process(g.ctoken2("timezone"),t.timezone));
g.timeSuffix=_.each(_.ignore(g.whiteSpace),_.set([g.tt,g.zzz]));
g.time=_.each(_.optional(_.ignore(_.stoken("T"))),g.hms,g.timeSuffix);
g.d=_.cache(_.process(_.each(_.rtoken(/^([0-2]\\d|3[0-1]|\\d)/),_.optional(g.ctoken2("ordinalSuffix"))),t.day));
g.dd=_.cache(_.process(_.each(_.rtoken(/^([0-2]\\d|3[0-1])/),_.optional(g.ctoken2("ordinalSuffix"))),t.day));
g.ddd=g.dddd=_.cache(_.process(g.ctoken("sun mon tue wed thu fri sat"),function(s)return function()this.weekday=s;;));
g.M=_.cache(_.process(_.rtoken(/^(1[0-2]|0\\d|\\d)/),t.month));
g.MM=_.cache(_.process(_.rtoken(/^(1[0-2]|0\\d)/),t.month));
g.MMM=g.MMMM=_.cache(_.process(g.ctoken("jan feb mar apr may jun jul aug sep oct nov dec"),t.month));
g.y=_.cache(_.process(_.rtoken(/^(\\d\\d?)/),t.year));
g.yy=_.cache(_.process(_.rtoken(/^(\\d\\d)/),t.year));
g.yyy=_.cache(_.process(_.rtoken(/^(\\d\\d?\\d?\\d?)/),t.year));
g.yyyy=_.cache(_.process(_.rtoken(/^(\\d\\d\\d\\d)/),t.year));
_fn=function()return _.each(_.any.apply(null,arguments),_.not(g.ctoken2("timeContext")));;
g.day=_fn(g.d,g.dd);
g.month=_fn(g.M,g.MMM);
g.year=_fn(g.yyyy,g.yy);
g.orientation=_.process(g.ctoken("past future"),function(s)return function()this.orient=s;;);
g.operator=_.process(g.ctoken("add subtract"),function(s)return function()this.operator=s;;);
g.rday=_.process(g.ctoken("yesterday tomorrow today now"),t.rday);
g.unit=_.process(g.ctoken("minute hour day week month year"),function(s)return function()this.unit=s;;);
g.value=_.process(_.rtoken(/^\\d\\d?(st|nd|rd|th)?/),function(s)return function()this.value=s.replace(/\\D/g,"");;);
g.expression=_.set([g.rday,g.operator,g.value,g.unit,g.orientation,g.ddd,g.MMM]);
_fn=function()return _.set(arguments,g.datePartDelimiter);;
g.mdy=_fn(g.ddd,g.month,g.day,g.year);
g.ymd=_fn(g.ddd,g.year,g.month,g.day);
g.dmy=_fn(g.ddd,g.day,g.month,g.year);
g.date=function(s)return((g[Date.CultureInfo.dateElementOrder]||g.mdy).call(this,s));;
g.format=_.process(_.many(_.any(_.process(_.rtoken(/^(dd?d?d?|MM?M?M?|yy?y?y?|hh?|HH?|mm?|ss?|tt?|zz?z?)/),function(fmt)
if(g[fmt])return g[fmt];
elsethrow Date.Parsing.Exception(fmt);
),_.process(_.rtoken(/^[^dMyhHmstz]+/),function(s)return _.ignore(_.stoken(s));))),
function(rules)return _.process(_.each.apply(null,rules),t.finishExact););
var _F=;
var _get=function(f)return _F[f]=(_F[f]||g.format(f)[0]);;
g.formats=function(fx)if(fx instanceof Array)var rx=[];for(var i=0;i<fx.length;i++)rx.push(_get(fx[i]));
return _.any.apply(null,rx);elsereturn _get(fx);;
g._formats=g.formats(["yyyy-MM-ddTHH:mm:ss","ddd, MMM dd, yyyy H:mm:ss tt","ddd MMM d yyyy HH:mm:ss zzz","d"]);
g._start=_.process(_.set([g.date,g.time,g.expression],g.generalDelimiter,g.whiteSpace),t.finish);
g.start=function(s)
tryvar r=g._formats.call(,s);if(r[1].length===0)return r;
catch(e)
return g._start.call(,s);
;
()
);
Date._parse=Date.parse;Date.parse=function(s)
var r=null;
if(!s)return null;
tryr=Date.Grammar.start.call(,s);catch(e)return null;
return((r[1].length===0)?r[0]:null);
;
Date.getParseFunction=function(fx)
var fn=Date.Grammar.formats(fx);
return function(s)
var r=null;
tryr=fn.call(,s);
catch(e)return null;
return((r[1].length===0)?r[0]:null);
;
;
Date.parseExact=function(s,fx)
return Date.getParseFunction(fx)(s);
;
return Date.parse(dateIn);
;'
如果我只是跑步：
select datejs('2/15/2009 05:22:37')
union all
select datejs('2012-03-29')
union all
select datejs(null)
或者：
select d_date, datejs(d_date) from SNOWFLAKE_SAMPLE_DATA.TPCDS_SF100TCL.DATE_DIM limit 1;
然后我没有收到错误并且该功能有效。如果我从表中进行选择：
select d_date, datejs(d_date) from SNOWFLAKE_SAMPLE_DATA.TPCDS_SF100TCL.DATE_DIM limit 2;
然后发生错误。为什么我可以在一个查询中合并多行，但我不能从一个表中选择多行并期望函数工作？
【问题讨论】：
它需要一个原子值。例如，在您的联合中，您将文字值传递给对函数的每次调用 3 次，而在您的第二个 select 语句中，您试图传递多个。您不应该简单地遍历表格中的每一行吗？ @jimmy8ball 嗯——这可能是真的。我本来希望设置在调用时像 SQL 中的任何其他函数一样运行。我曾期望它应该只在每行选定的该列的值上调用该函数，而不是一次调用所有选定的行。我还没有看到其他函数以这种方式运行。 证明该理论的一种方法是在您的联合中传递多个文字值，如果错误则证明该理论。构建一个简单的循环来遍历表中的每一行。 所以，我所做的是将联合变成子查询并将该函数应用于外部查询，然后它失败了。因此，您似乎没有以原子方式传递值是正确的。我将不得不看看尝试循环。 【参考方案1】：发生这种情况的原因是，Snowflake 不能保证每一行都有一个完全干净的 JavaScript 环境。这是出于性能原因。因此，前几行的副作用可能会影响后几行。
这样的话，我们看一下date.js中的这段代码：
...
Date.prototype._toString=Date.prototype.toString;
Date.prototype.toString=function(format) // REDACTED IRRELEVANT PARTS
return ... this._toString();
...
当此代码执行两次或更多次时，.toString 和._toString 都包含相同的代码，调用._toString，导致无限递归。
避免这种情况的方法是确保日期修改只发生一次。这可以使用以下代码模式来实现：
if (typeof(setup_done) === "undefined") // checking if a global variable is set
/* PUT HERE THE SETUP LOGIC */
setup_done = true; // setting global variable to true
今天的 Snowflake 文档对这种行为不够具体，我们会尽快澄清。
【讨论】：
谢谢马尔辛！我会试试这个。目前，我已经能够在不引用这个库的情况下编写我自己的 UDF，所以我本身不再“卡住”。但我想做这个功能，这是一个非常有用的解释！以上是关于雪花中的 JavaScript UDF的主要内容，如果未能解决你的问题，请参考以下文章