JavaScript UDF in Snowflake - snowflake-cloud-data-platform

Question

I'm attempting to utilize the date.js functions in Snowflake.
I've configured it in Snowflake to work as a UDF, but, I'm getting a recursion error when I use the function in a select from a table with more than 1 row.
JavaScript execution error: Uncaught RangeError: Maximum call stack size exceeded in DATEJS at ' Date.prototype._toString=Date.prototype.toString;Date.prototype.toString=function(format){' position 82 stackstrace: DATEJS.Date.toString line: 199 DATEJS.Date.toString line: 228 DATEJS.Date.toString line: 228...[snip]
This is the code:
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;}
else{throw 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;}else{w=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);}else{r=(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)]);}
else{throw 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){
try{rx=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){
try{r=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;try{r=p.call(this,s);}catch(e){return[null,s];}
return[r[0],r[1]];};
},
not:function(p){
return function(s){
try{p.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){
try{r=cache[s]=(cache[s]||rule.call(this,s));}
catch(e){r=cache[s]=e;}
if(r instanceof $P.Exception){throw r;}else{return 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;}
try{r=(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;}
try{r=(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++){
try{r=px[i].call(this,s);}
catch(e){break;}
rx.push(r[0]);
try{q=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){try{r=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);
try{r=px[i].call(this,s);}
catch(e){continue;}
rx=[[r[0]],r[1]];if(r[1].length>0&&!last){try{q=d.call(this,r[1]);}catch(ex){last=true;}}else{last=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){
try{q=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;}
}
else{return 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]);}else{return 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]));}
else{if(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);}
else{this.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];}
else{throw 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);}else{return _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){
try{var 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;}
try{r=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;
try{r=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);
};'
If I just run:
select datejs('2/15/2009 05:22:37')
union all
select datejs('2012-03-29')
union all
select datejs(null)
Or:
select d_date, datejs(d_date) from SNOWFLAKE_SAMPLE_DATA.TPCDS_SF100TCL.DATE_DIM limit 1;
Then I get no error and the function works. If I do a select from a table:
select d_date, datejs(d_date) from SNOWFLAKE_SAMPLE_DATA.TPCDS_SF100TCL.DATE_DIM limit 2;
Then the error occurs. Why is it that I can union multiple rows in a query, but I cannot select multiple rows from a table and expect the function to work?

Answer 1

The reason this happens is because Snowflake does not guarantee a completely clean JavaScript environment for each row. This is for performance reasons. As a result, side effects from previous rows can affect the following rows.
In this case, let's look at this piece of code in date.js:
...
Date.prototype._toString=Date.prototype.toString;
Date.prototype.toString=function(format){ // REDACTED IRRELEVANT PARTS
return ... this._toString();
}
...
When this code is executed twice, or more times, both .toString and ._toString contain the same code, which calls ._toString, resulting in infinite recursion.
The way to avoid it is to make sure the Date modifications happen only once. This can be achieved using the following code pattern:
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
}
Snowflake documentation today is not specific enough about this behavior, we will clarify it soon.