Question

我在蜂巢表中有并行数组，如下所示：

import React, { Component } from 'react'
import ReactQuill from 'react-quill'
import 'react-quill/dist/quill.snow.css'
import fire from '../../firebase'
import * as Icon from 'react-feather'

const CustomButton = () => <Icon.Save onClick={NoteEditor.modules.toolbar.handlers.writeUserNotes} />

const CustomToolbar = () => (
  <div id='toolbar'>
    <select className='ql-header' defaultValue={''} onChange={e => e.persist()}>
      <option value='1' />
      <option value='2' />
      <option selected />
    </select>
    <button className='ql-bold' />
    <button className='ql-italic' />
    <select className='ql-color'>
      <option value='red' />
      <option value='green' />
      <option value='blue' />
      <option value='orange' />
      <option value='violet' />
      <option value='#d0d1d2' />
      <option selected />
    </select>
    <button className='ql-save'>
      <CustomButton />
    </button>
  </div>
)

export default class NoteEditor extends Component {
  constructor (props) {
    super(props)
    this.state = { text: '' }
    this.handleChange = this.handleChange.bind(this)
  }

  writeUserNotes (user) {

  }

  handleChange (value) {
    this.setState({ text: value })
  }

  render () {
    return (
      <div className='text-editor w-80'>
        <CustomToolbar />
        <ReactQuill
          onChange={this.handleChange}
          modules={NoteEditor.modules}
          formats={NoteEditor.formats}
          theme={'snow'}
        />
      </div>
    )
  }
}

NoteEditor.modules = {
  toolbar: {
    container: '#toolbar',
    handlers: {
      writeUserNotes: () => {
        fire.database().ref('/notes').set({
          note: 
        })
      }
    }
  },
  clipboard: {
    matchVisual: false
  }
}

NoteEditor.formats = [
  'header',
  'font',
  'size',
  'bold',
  'italic',
  'underline',
  'strike',
  'blockquote',
  'list',
  'bullet',
  'indent',
  'link',
  'image',
  'color'
]

如何将它们压缩在一起（如python zip函数），以便获得结构列表，如

with tbl as ( select array(1,2,3) as x, array('a','b','c') as y) 
select x,y from tbl;



x       y
[1,2,3] ["a","b","c"]
1 row selected (0.108 seconds)

Answer 1

您可以posexplode使其在array中给出位置，然后将其用于过滤。

select x,y,collect_list(struct(val1,val2))
from tbl
lateral view posexplode(x) t1 as p1,val1
lateral view posexplode(y) t2 as p2,val2
where p1=p2
group by x,y

Answer 2

这是我为避免双重爆炸而做的尝试：

with tbl as (select array(1,2,3,4,5) as x, array('a','b','c','d','e') as y) 
select collect_list(struct(xi, y[i-1])) 
from tbl lateral view posexplode(x) tbl2 as xi, i;

但是，我遇到了一个奇怪的错误：

Error: Error while compiling statement: FAILED: IllegalArgumentException Size requested for unknown type: java.util.Collection (state=42000,code=40000)

我能够使用

解决它

set hive.execution.engine=mr;

不如使用spark或tez作为后端那样快速/优化。

Hive中的Zip并行数组

2 个答案: