小编Jur*_*kov的帖子

在 BigQuery 中，是否可以创建一个物化视图，其中包含基表中每个组的最新行。

例如

CREATE TABLE basetable (
  group_id INT64, timestamp TIMESTAMP, value FLOAT64
);

INSERT INTO basetable (group_id, timestamp, value) VALUES
(1, '2020-01-01', 0.1), 
(1, '2020-01-02', 0.2),
(2, '2020-01-02', 0.1),
(2, '2020-01-01', 0.2);

Base table
+----------+--------------+-------+
| group_id | timestamp    | value |
+----------+--------------+-------+
|    1     | '2020-01-01' |   0.1 |
|    1     | '2020-01-02' |   0.2 |
|    2     | '2020-01-02' |   0.1 |
|    2     | '2020-01-01  |   0.2 |
+----------+--------------+-------+

我希望物化视图如下所示

Materialized view 
+----------+--------------+-------+
| group_id …

在官方文档中，解释了如何在pycharm 2018.1上使用jupyter notebook的远程解释器。

https://www.jetbrains.com/help/pycharm/ipython-notebook-support.html

据说选择远程单选按钮，该按钮不存在，并且事件不在文档本身的屏幕截图中。

我错过了什么吗？

我需要使用promise返回的格式来格式化Date.我尝试从toView(value)返回promise.但这不起作用.

@autoinject
export class DateTimeValueConverter {

    constructor(private formatService:FormatService) {
    }

    toView(value) {
        return this.formatService.getFormat().then(format=>
            moment(value).format(format)
        );
    }

}

这是FormatService的代码,它可以正常工作

export class FormatService {

    private format;

    constructor(private http:AppHttp) {
        this.format= null;
    }

    public getFormat() : Promise<string>{

        if (this.format){
            var promise = new Promise<string>((resolve, reject)=>{
                resolve(this.format);
            });
            return promise;
        }

        return this.http.get('format')
            .then((format) => {
                if (format){
                    this.format= format;
                }
                return format;
            });
        }
}

在dart-web-components上运行pub install会出错:

Pub install fail, HttpParserException: Connection closed before full header was received

/dart-web-components/build.dart --changed=packages\args\args.dart --changed=packages\args\src\utils.dart --changed=packages\logging\...
Failed with error code 255
Unable to open file: C:/dartapps/dart-web-components/packages/web_components/component_build.dart'file:///C:/dartapps/dart-web-components/build.dart': Error: line 8 pos 1: library handler failed

import'package:web_components/component_build.dart'; ^

在build.dart文件中有一个字符串

import 'package:web_components/component_build.dart';

编辑器显示错误

Cannot find referenced source: package:web_components/component_build.dart    

component_build.dart包含错误

Cannot find referenced source: package:args/args.dart
Cannot find referenced source: package:web_components/dwc.dart

我使用 CXF 从 wsdl 生成 Java 类。是否可以为所有生成的类名称分配前缀？

例如,我创建了一个库,但它只存在于我的本地机器上.我想创建一个使用此库的单独应用程序.我怎么能和酒吧一起做？