benefit | Utility CSS-in-JS library | Frontend Utils library
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kandi X-RAY | benefit Summary
✨ Utility CSS-in-JS library that provides a set of low-level, configurable, ready-to-use styles
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QUESTION
Hello all!
I recently learned that in newer versions of SQL Server, the query optimizer can "expand" a SQL view and utilize inline performance benefits. This could have some drastic effects going forward on what kinds of database objects I create and why and when I create them, depending upon when this enhanced performance is achieved and when it is not.
For instance, I would not bother creating a parameterized inline table-valued function with a start date parameter and an end date parameter for an extremely large transaction table (where performance matters greatly) when I can just make a view and slap a WHERE
statement at the bottom of the calling query, something like
ANSWER
Answered 2021-Jun-14 at 22:08You will not find this information in the documentation, because it is not a single feature per se, it is simply the compiler/optimizer working its way through the query in various phases, using a number of different techniques to get the best execution plan. Sometimes it can safely push through predicates, sometimes it can't.
Note that "expanding the view" is the wrong term here. The view is always expanded into its definition (NOEXPAND
excepted). What you are referring to is called predicate pushdown.
I've assumed here that indexed views and
NOEXPAND
are not being used.
When you execute a query, the compiler starts by parsing and lexing the query into a basic execution plan. This is a very rough, unoptimized version which pretty much mirrors the query as written.
When there is a view in the query, the compiler will retrieve the view's pre-parsed execution tree and shoves it into the execution plan, again it is a very rough draft.
With derived tables, CTEs, correlated and non-correlated subqueries, as well as inline TVFs, the same thing happens, except that parsing is needed also.
After this point, you can assume that a view may as well have been written as a CTE, it makes no difference.
Can the optimizer push through the view?The compiler has a number of tricks up its sleeve, and predicate pushdown is one of them, as is simplifying views.
The ability of the compiler here is mainly dependent on whether it can deduce that a simplification is permitted, not that it is possible.
For example, this query
QUESTION
I am using the SQL connector to capture CDC on a table that we only expose a subset of all columns on the table. The table has two unique indexes A & B on it. Neither index is marked as the PRIMARY INDEX but index A is logically the primary key in our product and what I want to use with the connector. Index B references a column we don't expose to CDC. Index B isn't truly used in our product as a unique key for the table and it is only marked UNIQUE as it is known to be unique and marking it gives us a performance benefit.
This seems to be resulting in the error below. I've tried using the message.key.columns
option on the connector to specify index A as the key for this table and hopefully ignore index B. However, the connector seems to still want to do something with index B
- How can I work around this situation?
- For my own understanding, why does the connector care about indexes that reference columns not exposed by CDC?
- For my own understanding, why does the connector care about any index besides what is configured on the CDC table i.e. see CDC.change_tables.index_name documentation
ANSWER
Answered 2021-Jun-14 at 17:35One of the contributors to Debezium seems to affirm this is a product bug https://gitter.im/debezium/user?at=60b8e96778e1d6477d7f40b5. I have created an issue https://issues.redhat.com/browse/DBZ-3597.
Edit:
A PR was published and approved to fix the issue. The fix is in the current 1.6 beta snapshot build.
There is a possible workaround. The names of indices are the key to the problem. It seems they are processed in alphabetical order. Only the first one is taken into consideration so if you can rename your indices to have the one with keys first then you should get unblocked.
QUESTION
For my project I use Morphia, for easily mapping POJO objects to the Mongodb database. But in 2018 the mongo java driver started supporting pojo mapping it self and the Morphia project was abandoned by the Mongodb team. The Morphia community edition has now deprecated the DAO and I wonder, why not write my own DAO class based on the Mongodb driver directly? So my question:
Do we still need Morphia when using Mongodb and Java? And what benefits does Morphia bring over using the Mongodb Java driver directly?
...ANSWER
Answered 2021-Jun-14 at 03:41I'm the morphia dev so there's some bias here but i'll try to be fair. when i first started building the pojo support in to the driver (i used to work for mongodb) my goal was to build as close to an ODM as possible in the driver so that morphia, such as it was, would only need to be a thin veneer on the driver. Some of my plans never came to fruition as I left the company mid-effort. That said, it came pretty close.
I know of several projects that are happily using the pojo codecs. If they fit your needs, then I would suggest to just go with that. For my own perspective, I think morphia offers a fair bit that the driver doesn't (to my knowledge.) Morphia supports annotation driven index and document validation definitions, and collection caps, e.g. It's a bit more powerful and forgiving in mapping. e.g., morphia can map non-String keyed Maps as fields and I don't think the driver supports. Morphia supports lifecycle events but the driver does not and last I checked it seemed like Morphia's generics support had a slight edge. (Granted that edge is probably an extreme edge case that most won't run in to. It's been a while so the details are fuzzy.)
There are a few other features that Morphia has that the driver doesn't (transparent reference support, e.g.) and some features I have planned that the driver will never support (build-time generated codecs to eliminate most/all reflection at runtime, e.g.).
So do we still need Morphia? It depends on what you want to do. I plan on working on Morphia until no one needs it, though. :)
QUESTION
This Meteor app was created using meteor create alosh --full
, looking at the folder structure in Visual Studio Code, there is a line as in the image attached.
Is links a sub folder or api? If so, why is "links" not listed under "api" and instead next to it?
If not, then why import { Links } from "../../api/links/links.js"
; in the file fixtures.js showing "links" a sub folder of "api".
And BTW, how does such "sub folder" gets created where it sits next to "api" and not under it? And what is the reason/benefits?
Thanks
`
...ANSWER
Answered 2021-Jun-13 at 09:40I believe links
is listed next to api
because so far it's the only thing inside of the api
directory if you were to create more sub-apis it'd be listed underneath it as you'd expect. It's just a vscode UI.
Now, why does it sit underneath api
and not to next to it you may ask. It's because api
directory is intended to group all of your models' logic so sooner or later you'd end up creating a directory to hold them all.
QUESTION
Currently I have a Spring containers running in a Kubernetes cluster. I am going through Udacity's Spring web classes and find the Eureka server interesting.
Is there any benefit in using the Eureka server within the cluster?
any help will be appreciated.
Thank you
...ANSWER
Answered 2021-Jun-12 at 22:33This is mostly an option question but ... probably not? The core Service system does most of the same thing. But if you're specifically using Eureka's service metadata system then maybe?
QUESTION
I am working on a blazor server side project.
I wrote a repository pattern class for my queries and had some troubles with the function Task> GetAllModelsAsync()
. I want it to return a task so I can await its result within my partial components class to allow more responsive rendering.
I got it working using the following code:
...ANSWER
Answered 2021-Jun-12 at 08:27This is how I've been using Dapper. Works great:
- Make your Dapper method
async
. - Make the method or event that CALLS your method an
async Task
as well, so you canawait
the Task. - To return a list, do
return (await blah blah blah).ToList();
- Use the
Async
versions of all SQL calls.
Something seems a little off with your foreach loop. Would you mind explaining what you're trying to achieve with it? It seems like your first query should return all the models you need.
Example:
QUESTION
I'm fairly new in DBT and trying to explore how to exposures. I've already read the documentation ( https://docs.getdbt.com/docs/building-a-dbt-project/exposures ), but I do not feel that I get the answers to my questions.
I'm well aware of the concept that you create an exposures file in your models' folder, then you declare the table name and the other tables/sources that it depends on.
Q1 - Should I state the whole downstream of tables or just the direct tables that it depends on?
Q2 - What exact benefit does it do? Can you come up with a specific scenario?
Q3 - what the purpose of dbt run -m exposure:name and dbt test -m exposure:name? Is it testing the model or the exposure?
I've done exactly what they say in the documentation, I just do not get how I can use it.
Thank you in advance :-)
...ANSWER
Answered 2021-Jun-12 at 06:26I’m not an expert in exposures but I hope my answer can give you some directions.
Q1 - As far I’m aware you just need to specify the direct tables that it depends on. dbt would automatically handle the downstream references. It’s important to make sure that all your models and sources are properly configured and that you are using the ref and source function when referencing them. This is how dbt track the nodes and dependencies to generate the DAG for the documentation.
Q2 - One of the benefits of having exposure is that it improves your documentation and helps the team to understand how the data flow through the reporting/dashboard. Let’s say the business users asked for new requirements or changes need to be done in the dashboard, the analyst can easily go to the exposure and see all the dependencies, and the code that the dashboard is using and from there can make a fast decision and move the requirements to the ETL team or whatever. Another example could be related to refresh. Imagine you are working in a serie of objects from the same context or tag, for instance, project, and you need to refresh only the objects from the project scope that are being used in a specific dashboard. To achieve that, you can run the dbt command only for that exposure.
Q3 - The purpose of those commands is to run and test only the models and references of a particular exposure. You can think about this as a different way for tagging reporting objects or whatever were declared in the exposure. It can be really useful for some cases.
Hope that helps, thanks!
QUESTION
I'm new to gradle so I think/hope this is a beginners question.
Lets say I've two application projects and one library project where I put things like Utils and shared Classes which I often use on both applications.
Directory structure:
...ANSWER
Answered 2021-Jun-11 at 18:38If your projects often change together, consider merging them into a mono-repo and take advantage of multi module builds which will result in a directory structure similar to
QUESTION
I want to create a new type of variable which has his own constant values. So I want to do something likes this: (This is a not working example to explain the idea)
...ANSWER
Answered 2021-Jun-11 at 11:23What you are looking for is an enumeration type – designed specifically for the purpose you outline. Although you can use a plain, 'C-style' enum
, a more modern, C++ approach is to use a so-called "scoped enum"; see: Why is enum class preferred over plain enum?
Here's a possible implementation of your code using such a enum class
definition:
QUESTION
I've read Why doesn't Kotlin allow to use lateinit with primitive types?.
However, there is a benefit of using the lateinit
, that is, if the error is caused by no initialization, it can be immediately known from the error message. But for primitive types that cannot use lateinit
, such as Int, the user have to assign a value of 0. But if the appropriate value should be a value that is much greater than 0 and must be determined later, and then, the user forgot to init the value, the program produced an error later, is there any way to make the user who read the error message immediately realize that the error is not caused by other reasons?
thanks a lot.
And lateinit var v:Int? = null
is very bad, which makes operations like v--
become very complex.
ANSWER
Answered 2021-Jun-11 at 06:52The answer linked by you explains why it is technically impossible to support lateinit for primitive types. So even if there are benefits of having them, then... well, see above, it is technically impossible.
You can use a property delegate for a very similar effect:
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