-
Notifications
You must be signed in to change notification settings - Fork 63
/
window-functions.js
278 lines (252 loc) · 5.69 KB
/
window-functions.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
import error from '../util/error.js';
import isValid from '../util/is-valid.js';
import noop from '../util/no-op.js';
import NULL from '../util/null.js';
/**
* Initialize a window operator.
* @callback WindowInit
* @return {void}
*/
/**
* A storage object for the state of the window.
* @typedef {import('../verbs/window/window-state.js').default} WindowState
*/
/**
* Retrieve an output value from a window operator.
* @callback WindowValue
* @param {WindowState} state The window state object.
* @return {*} The output value.
*/
/**
* Initialize an aggregate operator.
* @typedef {import('./aggregate-functions.js').AggregateInit} AggregateInit
*/
/**
* Retrive an output value from an aggregate operator.
* @typedef {import('./aggregate-functions.js').AggregateValue} AggregateValue
*/
/**
* An operator instance for a window function.
* @typedef {object} WindowOperator
* @property {AggregateInit} init Initialize the operator.
* @property {AggregateValue} value Retrieve an output value.
*/
/**
* Create a new window operator instance.
* @callback WindowCreate
* @param {...any} params The aggregate operator parameters.
* @return {WindowOperator} The instantiated window operator.
*/
/**
* Create a new aggregate operator instance.
* @typedef {import('./aggregate-functions.js').AggregateCreate} AggregateCreate
*/
/**
* An operator definition for a window function.
* @typedef {object} WindowDef
* @property {AggregateCreate} create Create a new operator instance.
* @property {number[]} param Two-element array containing the
* counts of input fields and additional parameters.
*/
const rank = {
create() {
let rank;
return {
init: () => rank = 1,
value: w => {
const i = w.index;
return (i && !w.peer(i)) ? (rank = i + 1) : rank;
}
};
},
param: []
};
const cume_dist = {
create() {
let cume;
return {
init: () => cume = 0,
value: w => {
const { index, peer, size } = w;
let i = index;
if (cume < i) {
while (i + 1 < size && peer(i + 1)) ++i;
cume = i;
}
return (1 + cume) / size;
}
};
},
param: []
};
/**
* Window operator definitions.
*/
export default {
/** @type {WindowDef} */
row_number: {
create() {
return {
init: noop,
value: w => w.index + 1
};
},
param: []
},
/** @type {WindowDef} */
rank,
/** @type {WindowDef} */
avg_rank: {
create() {
let j, rank;
return {
init: () => (j = -1, rank = 1),
value: w => {
const i = w.index;
if (i >= j) {
for (rank = j = i + 1; w.peer(j); rank += ++j);
rank /= (j - i);
}
return rank;
}
};
},
param: []
},
/** @type {WindowDef} */
dense_rank: {
create() {
let drank;
return {
init: () => drank = 1,
value: w => {
const i = w.index;
return (i && !w.peer(i)) ? ++drank : drank;
}
};
},
param: []
},
/** @type {WindowDef} */
percent_rank: {
create() {
const { init, value } = rank.create();
return {
init,
value: w => (value(w) - 1) / (w.size - 1)
};
},
param: []
},
/** @type {WindowDef} */
cume_dist,
/** @type {WindowDef} */
ntile: {
create(num) {
num = +num;
if (!(num > 0)) error('ntile num must be greater than zero.');
const { init, value } = cume_dist.create();
return {
init,
value: w => Math.ceil(num * value(w))
};
},
param: [0, 1]
},
/** @type {WindowDef} */
lag: {
create(offset, defaultValue = NULL) {
offset = +offset || 1;
return {
init: noop,
value: (w, f) => {
const i = w.index - offset;
return i >= 0 ? w.value(i, f) : defaultValue;
}
};
},
param: [1, 2]
},
/** @type {WindowDef} */
lead: {
create(offset, defaultValue = NULL) {
offset = +offset || 1;
return {
init: noop,
value: (w, f) => {
const i = w.index + offset;
return i < w.size ? w.value(i, f) : defaultValue;
}
};
},
param: [1, 2]
},
/** @type {WindowDef} */
first_value: {
create() {
return {
init: noop,
value: (w, f) => w.value(w.i0, f)
};
},
param: [1]
},
/** @type {WindowDef} */
last_value: {
create() {
return {
init: noop,
value: (w, f) => w.value(w.i1 - 1, f)
};
},
param: [1]
},
/** @type {WindowDef} */
nth_value: {
create(nth) {
nth = +nth;
if (!(nth > 0)) error('nth_value nth must be greater than zero.');
return {
init: noop,
value: (w, f) => {
const i = w.i0 + (nth - 1);
return i < w.i1 ? w.value(i, f) : NULL;
}
};
},
param: [1, 1]
},
/** @type {WindowDef} */
fill_down: {
create(defaultValue = NULL) {
let value;
return {
init: () => value = defaultValue,
value: (w, f) => {
const v = w.value(w.index, f);
return isValid(v) ? (value = v) : value;
}
};
},
param: [1, 1]
},
/** @type {WindowDef} */
fill_up: {
create(defaultValue = NULL) {
let value, idx;
return {
init: () => (value = defaultValue, idx = -1),
value: (w, f) => w.index <= idx ? value
: (idx = find(w, f, w.index)) >= 0 ? (value = w.value(idx, f))
: (idx = w.size, value = defaultValue)
};
},
param: [1, 1]
}
};
function find(w, f, i) {
for (const n = w.size; i < n; ++i) {
if (isValid(w.value(i, f))) return i;
}
return -1;
}