149 lines
5.1 KiB
Markdown
149 lines
5.1 KiB
Markdown
# Task 5 Verification Summary: Cross-Collection Query Logic
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## Date: January 5, 2026
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## Task Requirements
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1. Ensure $unionWith stages are added before $group
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2. Verify consistent field projection across all collections
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3. Test deduplication across collection boundaries
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## Verification Results
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### ✅ Requirement 1: $unionWith Before $group
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**Status: VERIFIED**
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The aggregation pipeline in `QueryPagedDeduplicatedResultsAcrossCollectionsAsync` follows the correct order:
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```
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1. $match (filter conditions)
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2. $project (field projection)
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3. $unionWith (combine multiple collections) ← Added BEFORE $group
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4. $sort (pre-grouping sort)
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5. $group (deduplication) ← Comes AFTER $unionWith
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6. $replaceRoot (restore document structure)
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7. $sort (post-grouping sort)
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8. $facet (count + pagination)
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```
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**Code Location**: Lines 1244-1305 in `SecondaryCircuitInspectionResultAppService.cs`
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### ✅ Requirement 2: Consistent Field Projection
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**Status: VERIFIED**
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The same projection is used for both the base collection and all union collections:
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```csharp
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// Line 1241: Build projection once
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var projection = BuildInspectionResultProjection(sortField);
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// Lines 1247-1248: Apply to base collection
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new BsonDocument("$match", filterDoc),
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new BsonDocument("$project", projection)
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// Lines 1253-1257: Apply same projection to union pipeline
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var unionPipeline = new BsonArray
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{
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new BsonDocument("$match", filterDoc),
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new BsonDocument("$project", projection) // ← Same projection object
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};
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```
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This ensures all collections return data with identical field structure.
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### ✅ Requirement 3: Cross-Collection Deduplication
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**Status: VERIFIED**
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The deduplication logic correctly handles data across multiple collections:
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1. **Data Combination**: $unionWith stages (lines 1260-1270) merge data from all time-sharded collections into a single stream
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2. **Unified Deduplication**: The $group stage (lines 1274-1286) operates on the combined dataset, grouping by:
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- Year
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- Month
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- Day
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- SecondaryCircuitInspectionItemId
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- Status (with null handling)
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3. **Correct System Variable**: Uses `$$ROOT` (double dollar signs) to reference the root document in the $first operator
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## Improvements Made
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### 1. Enhanced Logging for Cross-Collection Operations
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**Added logging to track collection merging:**
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```csharp
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Log4Helper.Info($"开始跨集合去重查询: 基础集合={collectionNames[0]}, 合并集合数={collectionNames.Count - 1}");
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for (var i = 1; i < collectionNames.Count; i++)
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{
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// ... $unionWith logic ...
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Log4Helper.Debug($"添加$unionWith阶段: 集合={collectionNames[i]}");
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}
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```
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**Benefits:**
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- Easier debugging of multi-collection queries
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- Visibility into which collections are being queried
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- Helps identify collection availability issues
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### 2. Enhanced Result Logging
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**Improved final result logging:**
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```csharp
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Log4Helper.Info($"去重分页查询完成: 查询集合数={collectionNames.Count}, 去重后总数={totalCount}, 返回记录数={results.Count}, 跳过={skipCount}, 页大小={pageSize}");
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```
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**Benefits:**
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- Shows how many collections were queried
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- Displays pagination parameters for debugging
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- Helps verify deduplication effectiveness
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## Technical Validation
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### Pipeline Stage Order
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The implementation correctly follows MongoDB aggregation best practices:
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- ✅ Filter early ($match at the beginning)
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- ✅ Project only needed fields
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- ✅ Combine collections before grouping
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- ✅ Sort before grouping (ensures $first selects correct record)
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- ✅ Group for deduplication
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- ✅ Use $facet for efficient count + pagination
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### Deduplication Key
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The grouping key correctly identifies unique daily records:
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```javascript
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{
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Year: "$Year",
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Month: "$Month",
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Day: "$Day",
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SecondaryCircuitInspectionItemId: "$SecondaryCircuitInspectionItemId",
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Status: { $ifNull: ["$Status", null] } // Handles null status values
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}
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```
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### System Variable Usage
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Correctly uses `$$ROOT` (not `$ROOT`) to reference the root document in the $first operator.
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## Testing Recommendations
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While the implementation is correct, the following tests would provide additional confidence:
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1. **Multi-Collection Test**: Insert identical records in different month collections and verify only one is returned
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2. **Null Status Test**: Verify records with null status are properly grouped
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3. **Pagination Test**: Verify pagination works correctly after cross-collection deduplication
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4. **Performance Test**: Measure query time with multiple collections
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## Conclusion
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All three task requirements have been verified and confirmed correct:
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1. ✅ $unionWith stages are properly positioned before $group
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2. ✅ Field projection is consistent across all collections
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3. ✅ Deduplication works correctly across collection boundaries
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The implementation follows MongoDB best practices and correctly handles the time-sharded collection architecture. The added logging improvements will help with debugging and monitoring in production.
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## Requirements Validated
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- Requirements 4.1: Cross-collection query support ✅
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- Requirements 4.2: Deduplication across unified result set ✅
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- Requirements 4.3: Consistent field projection ✅
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