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Update and Delete operations for jsonb (part 2 of 2)


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Title Update and Delete operations for jsonb (part 2 of 2)
Subtitle New Features and Directions for jsonb in PostgreSQL
Title of Series PGCon 2015
Number of Parts 29
Author Dunstan, Andrew
Contributors Crunchy Data Solutions (Support)
License CC Attribution - ShareAlike 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor and the work or content is shared also in adapted form only under the conditions of this license.
DOI 10.5446/19151
Publisher PGCon - PostgreSQL Conference for Users and Developers, Andrea Ross
Release Date 2015
Language English
Production Place Ottawa, Canada

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Subject Area Computer Science
Abstract providing some needed functions and operators for jsonb Postgres 9.4 introduced the new jsonb type, However, it is missing some functions, particularly for json composition, that are needed by many users. In this talk we present an extension that provides some of these functions, and work to incorporate the functions in 9.5. Operations include replacement and deletion of array elements and object fields, and composition by concatentation of objects and arrays. Arrays can also be concatenated with scalar values, and array elements can be replaced or deleted by counting from either end of the array. Thus we have the ability to use json arrays as queues and stacks, with basic push/pop and shift/unshift capability. A pretty print function for jsonb is also provided. We will also outline what work we think remains, and discuss possible ideas on how to make json composition more naturally expressed.
so used as I just talked
about his is basically all the things that somebody just the stuff we just looked at his this part this operator that takes will delete a path for an element of the plan this there are some of things
that we've also added in 1 9 . 5 but there were a bunch of things that we brought in for the day sometimes we don't have time to get to a 9 non-default good for Jason be because it was a fairly like inference and so we've we've extended that is provided facilities for days and days and be basically uh we can turn every element into adjacent be an array or road just about anything on and they're all there these other things which are basically things to build up this is all of build objects and the objects in philly outre way so you can pretty much construct these objects with any shape of all the 2nd thing we did was we had a request to strip some strip novels out of to be of nulls and Jason B. to reduce storage requirements and and J. Song for that matter and that was something we had in and finally Tom work to reduce past of crimes from Jason Jason backwards and the other way round so that all functions would work harmoniously together without having to do some fairly with test so we
talked at the UN Conference about some future directions here's a hint of some don't talk for the rest of my talk about some of those 1 of them is this notion jason pointer which is an highest Sea and usually 1 of the principal authors I noticed today was actually somebody from sales force on and it's basically about an hour is is a standardized way of expressing parts within Jason documents most all the functions we currently got expressed parsers arrays of text on the idea would be to have to change that possibly depending on how well we can get it to be backwards compatible so you can on the express parts in a standardized format here's an example here this these path and from the values of the parts in this jason . of format which is fairly similar to the sort of thing you see in its path and other other similar languages this and then there's dates and perhaps this is an exact this whole thing here is the example of adjacent packages essentially a set of operations that you could apply to adjacent documents so you can see notes that you can test if something is true and if it's not then stop or you can remove and replacement of a property of bits and pieces of the document and and and the nice thing about that is that whereas using Jason be set you can just do 1 bit at a time or Jason be delayed 1 bit at a time here you can do a whole lot of things all in 1 hit and it's actually know if we had this you would be other make all these changes and much more efficiently than having a bunch of sequel function calls we have 1 call here which will offer you know just iterate over this this array and make this changes 1 that can operate in the basis of the in rights ABM express that much more concisely using this every still fairly weighty format but the it would be a whole lot more efficient than than this function calls and as a set and as you say it's also an standard these these 2 stands for written pretty much together and that designed to work together before I go down that path my intention is to see how widespread the use of this is because I don't see even though standards identity they use the 0 point in adopting something that isn't a reasonably widely used so I'm looking for information on their moment but that and everything that anybody can help me with you on that would be good at
another thing we discussed and a number of so interested in I pretty much everybody in the in the that's to having to j something this is a good idea is instead of having to do something like this and the set is to have this sort of notation which essentially allows you to address a i part of the document as no value on which of the 2 set all to test and that would be it make the language of would do more expressive you worked with him well the trouble is that we want be firstly it's gotta be something that we can fit reasonably within asyntactic framework and secondly when we have to do this for more than just a son and so deliberately put that up because that's essentially the of this index that you can use today with the rights and so essentially we're we're extending this index we've already got how just
1 and exists operator with that indexable I'm not sure whether we can actually use the existing indexes for that or not so we would need to look at the case there's no need to be not to have something like that possibly with and without needing to as queries and there's been some suggestion about that we should be introduced selectively operators for a dread of June and its operations essentially way pundit on that to today so which we need to look at what we can do to improve the selectivity indexes estimators
and I have another suggestion that's it has been that we should do some sort of schema validation there is a there is this on the that counts as a standard because it's never been adopted by the IETF and but it so I believe it's reasonably widely used and essentially it's a way of saying well the dice on needs to have this shape and you can say know must have these elements all and you know it must have so many of these and so on and as it might be worth having an extension on which implements that validation and then you could use the list the validation function a check constraints the query language
on leave it's highly 2 2 0 again Alexander right on top of that now was kind of of land away by the the the ambition of their talk to the thing and that looks like this this exciting stuff happening on that front so
that is pretty much of what's been happening on this and what you what's on the horizon end many that's yeah that's pretty much what what to say said and got any questions know used in waiting area stretching so that was the author of the of the of the of the of I mean that's the kind of facile judgment honestly I'm and any anybody that without actually quite quite and benchmarks is just buying smoke on so yeah I I and I have no patience with and that sort of thing never somebody wants to say should be be using on the statement that the minimum of forgotten government and the thing is that that the guards and restoring who decomposing days on storing posters tables so yeah this 1 so if if you ask that there may well be good cases for doing that versus using non-native facilities you know that there's a because they're dissolving away keys and ineffective in effect in the column names on it know in certain cases this set this saving masses of of of of space they can compress and pretty well on you know there are other cases where it's problem uh you know this is this is probably not such a good case if if if if only an hour exam they managed to bring about this dictionary thing then probably the case for that but this goes away again yes yeah I mean my attitude is generally that you should you should use this in a hybrid applications where you need some of the some of the fairly traditional semantics that we provide in terms of of of transactional integrity and other things that you don't get with a lot of the uh the of what Richard it calls the postmodern databases and and and you know about where you need a semi-structured format because you can't you know you don't know at the time of building a replication exactly the shape the certain will sit sort of data are going to take me injustice dealing with a number of things like that in cases like that at the moment and you know what I would I would be in the situation where you got to be you know all 1 all the other and 1 of things suppose post this is really providing for you is the ability to say OK the space of data and onions stores J. I'm going to pay some of the processes that we got was days on Jason and the rest of my data I'm the story in text and integer and died data in the traditional database fields and you can do that very nicely impulses posters with very very well for the sorts of hybrid applications where where you mixing traditional data types and semi-structured data the article all of the individual that produces placed on top the meaning of the words that we obtain a knowledge of the year so I again do you know what they're going to allow the user to things that would be the water J. Song of the year so there's there's enormous new states and so they can actually replace in place without needing to write your part about a year and that all the of the of the vector so they're basically acting a lot of the do you that you can actually see this in terms of the sizes of the series on on this part of that so you need to know what is the origin of the 2 that lived here that would be theoretically possible so that we can reduce the in the data you the want the the use of a lot of the contents of the variables you want to introduce you to the city castle very like Jason values among the yet another this is the maximum size of the 16 megabytes something yeah so what you know and we we certainly don't have that limit the the depth of the room the group of all the room was the only 1 I know of that applies to this which is being adapted for post-crisis when you look at this at the 1 get the thing and get had there because I think there are a couple of things called days Query 73 cable you looking for I think I but the here now allows a morphism or based standards and then test queries currently got the same I think it's in the in the early this year so you know that they had been made and what I believe that the estimated now I have not used to like in this and then there was the reason you can also use it and all the all the all the time we wish we store on um number day some numbers as numerics and which are essentially uh arbitrarily size and proceed and fixed fixed-precision numbers right in the day some standard states you can see there is no limit on the size of on the number of digits you can have an an antigen and we are 1 of the very few implementations that actually lets you do that on the other side but because the mean and you need you need to I mean that anybody would but what is when he would like us to do this is 1 of the people of the of the heat that's that's a terrible thing to do anything about it what what you think about it and that was that they were going to included in the case of the only thing that will get for all the way work a little work on on the media have have have have now may I mean the Robert right up to the original parse of adjacent to and and that true job and he was very very good about staying very very close to the exact J. Song of uh respect so there's pretty much nothing we if we have been what we've found a little bit on the encoding issues you but because we have to that but but apart from that it would pretty much better known with the space and because you has have the right to the heart of the year and that you have to have a little knowledge of to find and that and the other as well right and some of the ideas and here the the the the the the the right of the of the starting line so that you have to wonder if you know you have to look at look at we also the the relationship of the University of the other 1 I mean it if we could probably and you probably create function that would actually be a what would would allow translating the J. song but I mean we're not going to build that into the parser but you if you want something that will win I mean just in the way that got that we had a friend this new function that will will strip now that you could have a have a functional unit convert numerics or something like that on the just because of the testing and the little fill next game theory does for that prior on well the data and we know what an all they begin Alexander said today was they don't want to build a query in the PostScript sets currently an extension which you could which is a level model right and that's what and that's what I want to uh that's why they want people why Cisco look on gonna have to be because it is it there there's no way you can have something generic that's going to be able to take advantage of of indexing and press you you need to have the you know an operatic class which we are all going and then we we do have on it and XML generation functions right move move according we implement the most of the spec XML element axonal forest carrier the other right 1 but only 1 of the things is there is no indexing XML at all to build a then would be a huge part so 1 of the you know if we if if we had we want having mixing we're going to have to to have building operations in the world and have yet to be in the image of of of the of the of the world of but must necessarily for validation is a about and then fixed past queries that's about the next level we use it for you use of the units that we all know that there something we said we are working and you have implementation the and so the problem is in the world that the usual external was the site where there was theorem or be in the case of 3 . 1 use the sandbox and binary formats as well for the data formats that so here in the in the world that 1 of the 3 days of the week is that we were very so old it is that you in them all in the very variable early is where the over all these years old people always do you know that all of the yeah the trouble was that they that there were also binary things that you couldn't store at all of there were all know we can do it well I'm not going to go unreported stuff out and now it's it's using it's it's it's it's tied into closely to uh to uh the resistance and the I mean we using string for accumulating stuff tied into the back in very closely OK right thank you all for coming
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