-
Notifications
You must be signed in to change notification settings - Fork 3.1k
/
CosmosQueryableMethodTranslatingExpressionVisitor.cs
527 lines (422 loc) · 20.8 KB
/
CosmosQueryableMethodTranslatingExpressionVisitor.cs
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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Query.Pipeline;
using Microsoft.EntityFrameworkCore.Storage;
namespace Microsoft.EntityFrameworkCore.Cosmos.Query.Pipeline
{
public class CosmosQueryableMethodTranslatingExpressionVisitor : QueryableMethodTranslatingExpressionVisitor
{
private readonly IModel _model;
private readonly ISqlExpressionFactory _sqlExpressionFactory;
private readonly CosmosSqlTranslatingExpressionVisitor _sqlTranslator;
private readonly CosmosProjectionBindingExpressionVisitor _projectionBindingExpressionVisitor;
public CosmosQueryableMethodTranslatingExpressionVisitor(
IModel model,
ISqlExpressionFactory sqlExpressionFactory,
IMemberTranslatorProvider memberTranslatorProvider,
IMethodCallTranslatorProvider methodCallTranslatorProvider)
: base(subquery: false)
{
_model = model;
_sqlExpressionFactory = sqlExpressionFactory;
_sqlTranslator = new CosmosSqlTranslatingExpressionVisitor(
model,
sqlExpressionFactory,
memberTranslatorProvider,
methodCallTranslatorProvider);
_projectionBindingExpressionVisitor = new CosmosProjectionBindingExpressionVisitor(_sqlTranslator);
}
public override ShapedQueryExpression TranslateSubquery(Expression expression)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression CreateShapedQueryExpression(Type elementType)
{
var entityType = _model.FindEntityType(elementType);
var selectExpression = _sqlExpressionFactory.Select(entityType);
return new ShapedQueryExpression(
selectExpression,
new EntityShaperExpression(
entityType,
new ProjectionBindingExpression(
selectExpression,
new ProjectionMember(),
typeof(ValueBuffer)),
false));
}
protected override ShapedQueryExpression TranslateAll(ShapedQueryExpression source, LambdaExpression predicate)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateAny(ShapedQueryExpression source, LambdaExpression predicate)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateAverage(ShapedQueryExpression source, LambdaExpression selector, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (selector != null)
{
source = TranslateSelect(source, selector);
}
var projection = (SqlExpression)selectExpression.GetMappedProjection(new ProjectionMember());
projection = _sqlExpressionFactory.Function(
"AVG", new[] { projection }, projection.Type, projection.TypeMapping);
return AggregateResultShaper(source, projection, throwOnNullResult: true, resultType);
}
protected override ShapedQueryExpression TranslateCast(ShapedQueryExpression source, Type resultType)
{
if (source.ShaperExpression.Type == resultType)
{
return source;
}
source.ShaperExpression = Expression.Convert(source.ShaperExpression, resultType);
return source;
}
protected override ShapedQueryExpression TranslateConcat(ShapedQueryExpression source1, ShapedQueryExpression source2)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateContains(ShapedQueryExpression source, Expression item)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateCount(ShapedQueryExpression source, LambdaExpression predicate)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function("COUNT", new[] { _sqlExpressionFactory.Constant(1) }, typeof(int)));
var projectionMapping = new Dictionary<ProjectionMember, Expression>
{
{ new ProjectionMember(), translation }
};
selectExpression.ClearOrdering();
selectExpression.ReplaceProjectionMapping(projectionMapping);
source.ShaperExpression = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), typeof(int));
return source;
}
protected override ShapedQueryExpression TranslateDefaultIfEmpty(ShapedQueryExpression source, Expression defaultValue)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateDistinct(ShapedQueryExpression source)
{
((SelectExpression)source.QueryExpression).ApplyDistinct();
return source;
}
protected override ShapedQueryExpression TranslateElementAtOrDefault(ShapedQueryExpression source, Expression index, bool returnDefault)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateExcept(ShapedQueryExpression source1, ShapedQueryExpression source2)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateFirstOrDefault(ShapedQueryExpression source, LambdaExpression predicate, Type returnType, bool returnDefault)
{
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ApplyLimit(TranslateExpression(Expression.Constant(1)));
if (source.ShaperExpression.Type != returnType)
{
source.ShaperExpression = Expression.Convert(source.ShaperExpression, returnType);
}
return source;
}
protected override ShapedQueryExpression TranslateGroupBy(ShapedQueryExpression source, LambdaExpression keySelector, LambdaExpression elementSelector, LambdaExpression resultSelector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateGroupJoin(ShapedQueryExpression outer, ShapedQueryExpression inner, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector, LambdaExpression resultSelector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateIntersect(ShapedQueryExpression source1, ShapedQueryExpression source2)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateJoin(ShapedQueryExpression outer, ShapedQueryExpression inner, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector, LambdaExpression resultSelector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateLastOrDefault(ShapedQueryExpression source, LambdaExpression predicate, Type returnType, bool returnDefault)
{
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ReverseOrderings();
selectExpression.ApplyLimit(TranslateExpression(Expression.Constant(1)));
if (source.ShaperExpression.Type != returnType)
{
source.ShaperExpression = Expression.Convert(source.ShaperExpression, returnType);
}
return source;
}
protected override ShapedQueryExpression TranslateLeftJoin(ShapedQueryExpression outer, ShapedQueryExpression inner, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector, LambdaExpression resultSelector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateLongCount(ShapedQueryExpression source, LambdaExpression predicate)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function("COUNT", new[] { _sqlExpressionFactory.Constant(1) }, typeof(long)));
var projectionMapping = new Dictionary<ProjectionMember, Expression>
{
{ new ProjectionMember(), translation }
};
selectExpression.ClearOrdering();
selectExpression.ReplaceProjectionMapping(projectionMapping);
source.ShaperExpression = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), typeof(long));
return source;
}
protected override ShapedQueryExpression TranslateMax(ShapedQueryExpression source, LambdaExpression selector, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (selector != null)
{
source = TranslateSelect(source, selector);
}
var projection = (SqlExpression)selectExpression.GetMappedProjection(new ProjectionMember());
projection = _sqlExpressionFactory.Function("MAX", new[] { projection }, resultType, projection.TypeMapping);
return AggregateResultShaper(source, projection, throwOnNullResult: true, resultType);
}
protected override ShapedQueryExpression TranslateMin(ShapedQueryExpression source, LambdaExpression selector, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (selector != null)
{
source = TranslateSelect(source, selector);
}
var projection = (SqlExpression)selectExpression.GetMappedProjection(new ProjectionMember());
projection = _sqlExpressionFactory.Function("MIN", new[] { projection }, resultType, projection.TypeMapping);
return AggregateResultShaper(source, projection, throwOnNullResult: true, resultType);
}
protected override ShapedQueryExpression TranslateOfType(ShapedQueryExpression source, Type resultType)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateOrderBy(ShapedQueryExpression source, LambdaExpression keySelector, bool ascending)
{
var translation = TranslateLambdaExpression(source, keySelector);
if (translation != null)
{
((SelectExpression)source.QueryExpression).ApplyOrdering(new OrderingExpression(translation, ascending));
return source;
}
throw new InvalidOperationException();
}
protected override ShapedQueryExpression TranslateReverse(ShapedQueryExpression source)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateSelect(ShapedQueryExpression source, LambdaExpression selector)
{
if (selector.Body == selector.Parameters[0])
{
return source;
}
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct)
{
throw new InvalidOperationException();
}
var newSelectorBody = ReplacingExpressionVisitor.Replace(selector.Parameters.Single(), source.ShaperExpression, selector.Body);
source.ShaperExpression = _projectionBindingExpressionVisitor
.Translate(selectExpression, newSelectorBody);
return source;
}
protected override ShapedQueryExpression TranslateSelectMany(ShapedQueryExpression source, LambdaExpression collectionSelector, LambdaExpression resultSelector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateSelectMany(ShapedQueryExpression source, LambdaExpression selector)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateSingleOrDefault(ShapedQueryExpression source, LambdaExpression predicate, Type returnType, bool returnDefault)
{
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ApplyLimit(TranslateExpression(Expression.Constant(2)));
if (source.ShaperExpression.Type != returnType)
{
source.ShaperExpression = Expression.Convert(source.ShaperExpression, returnType);
}
return source;
}
protected override ShapedQueryExpression TranslateSkip(ShapedQueryExpression source, Expression count)
{
var selectExpression = (SelectExpression)source.QueryExpression;
var translation = TranslateExpression(count);
if (translation != null)
{
selectExpression.ApplyOffset(translation);
return source;
}
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateSkipWhile(ShapedQueryExpression source, LambdaExpression predicate)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateSum(ShapedQueryExpression source, LambdaExpression selector, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct
|| selectExpression.Limit != null
|| selectExpression.Offset != null)
{
throw new InvalidOperationException();
}
if (selector != null)
{
source = TranslateSelect(source, selector);
}
var serverOutputType = resultType.UnwrapNullableType();
var projection = (SqlExpression)selectExpression.GetMappedProjection(new ProjectionMember());
projection = _sqlExpressionFactory.Function(
"SUM", new[] { projection }, serverOutputType, projection.TypeMapping);
return AggregateResultShaper(source, projection, throwOnNullResult: false, resultType);
}
protected override ShapedQueryExpression TranslateTake(ShapedQueryExpression source, Expression count)
{
var selectExpression = (SelectExpression)source.QueryExpression;
var translation = TranslateExpression(count);
if (translation != null)
{
selectExpression.ApplyLimit(translation);
return source;
}
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateTakeWhile(ShapedQueryExpression source, LambdaExpression predicate)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateThenBy(ShapedQueryExpression source, LambdaExpression keySelector, bool ascending)
{
var translation = TranslateLambdaExpression(source, keySelector);
if (translation != null)
{
((SelectExpression)source.QueryExpression).AppendOrdering(new OrderingExpression(translation, ascending));
return source;
}
throw new InvalidOperationException();
}
protected override ShapedQueryExpression TranslateUnion(ShapedQueryExpression source1, ShapedQueryExpression source2)
{
throw new NotImplementedException();
}
protected override ShapedQueryExpression TranslateWhere(ShapedQueryExpression source, LambdaExpression predicate)
{
var translation = TranslateLambdaExpression(source, predicate);
if (translation != null)
{
((SelectExpression)source.QueryExpression).ApplyPredicate(translation);
return source;
}
throw new InvalidOperationException();
}
private SqlExpression TranslateExpression(Expression expression)
=> _sqlTranslator.Translate(expression);
private SqlExpression TranslateLambdaExpression(
ShapedQueryExpression shapedQueryExpression, LambdaExpression lambdaExpression)
{
var lambdaBody = RemapLambdaBody(shapedQueryExpression.ShaperExpression, lambdaExpression);
return TranslateExpression(lambdaBody);
}
private Expression RemapLambdaBody(Expression shaperBody, LambdaExpression lambdaExpression)
{
return ReplacingExpressionVisitor.Replace(lambdaExpression.Parameters.Single(), shaperBody, lambdaExpression.Body);
}
private ShapedQueryExpression AggregateResultShaper(
ShapedQueryExpression source, Expression projection, bool throwOnNullResult, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.ReplaceProjectionMapping(
new Dictionary<ProjectionMember, Expression>
{
{ new ProjectionMember(), projection }
});
selectExpression.ClearOrdering();
Expression shaper = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), projection.Type);
if (throwOnNullResult)
{
var resultVariable = Expression.Variable(projection.Type, "result");
shaper = Expression.Block(
new[] { resultVariable },
Expression.Assign(resultVariable, shaper),
Expression.Condition(
Expression.Equal(resultVariable, Expression.Default(projection.Type)),
Expression.Throw(
Expression.New(
typeof(InvalidOperationException).GetConstructors()
.Single(ci => ci.GetParameters().Length == 1),
// TODO: See issue#16164
Expression.Constant("Insert exception message here")),
resultType),
resultType != resultVariable.Type
? Expression.Convert(resultVariable, resultType)
: (Expression)resultVariable));
}
else if (resultType.IsNullableType())
{
shaper = Expression.Convert(shaper, resultType);
}
source.ShaperExpression = shaper;
return source;
}
}
}