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feat: support generating shell syntax for $group
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176 changes: 176 additions & 0 deletions
176
...godb-dialects/mongosh/src/main/kotlin/com/mongodb/jbplugin/dialects/mongosh/aggr/Group.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| package com.mongodb.jbplugin.dialects.mongosh.aggr | ||
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|
||
| import com.mongodb.jbplugin.dialects.mongosh.backend.MongoshBackend | ||
| import com.mongodb.jbplugin.dialects.mongosh.query.resolveFieldReference | ||
| import com.mongodb.jbplugin.dialects.mongosh.query.resolveValueReference | ||
| import com.mongodb.jbplugin.mql.Node | ||
| import com.mongodb.jbplugin.mql.components.HasAccumulatedFields | ||
| import com.mongodb.jbplugin.mql.components.HasFieldReference | ||
| import com.mongodb.jbplugin.mql.components.HasLimit | ||
| import com.mongodb.jbplugin.mql.components.HasSorts | ||
| import com.mongodb.jbplugin.mql.components.HasValueReference | ||
| import com.mongodb.jbplugin.mql.components.Name | ||
| import com.mongodb.jbplugin.mql.components.Named | ||
|
|
||
| internal fun <S>MongoshBackend.emitGroupStage(node: Node<S>): MongoshBackend { | ||
| val idFieldReference = node.component<HasFieldReference<S>>() | ||
| val idValueReference = node.component<HasValueReference<S>>() | ||
|
|
||
| val accumulatedFields = node.component<HasAccumulatedFields<S>>()?.children ?: emptyList() | ||
| val emitLongQuery = idValueReference.isLongIdValueReference() || accumulatedFields.size > 2 | ||
|
|
||
| // "{" | ||
| emitObjectStart(long = emitLongQuery) | ||
| // "{ $group : " | ||
| emitObjectKey(registerConstant('$' + "group")) | ||
| // "{ $group : { " | ||
| emitObjectStart(long = emitLongQuery) | ||
| if (idFieldReference != null && idValueReference != null) { | ||
| // "{ $group : { _id : null, " | ||
| emitAsFieldValueDocument(listOf(node), isLong = emitLongQuery) | ||
| // "{ $group : { _id : null, totalCount: { $sum : 1 }, " | ||
| emitAccumulatedFields(accumulatedFields, emitLongQuery) | ||
| } | ||
| // "{ $group : { _id : null, totalCount: { $sum : 1 }, }" | ||
| emitObjectEnd(long = emitLongQuery) | ||
| // "{ $group : { _id : null, totalCount: { $sum : 1 }, } }" | ||
| emitObjectEnd(long = emitLongQuery) | ||
|
|
||
| return this | ||
| } | ||
|
|
||
| private fun <S>HasValueReference<S>?.isLongIdValueReference(): Boolean { | ||
| val computedReference = this?.reference as? HasValueReference.Computed<S> | ||
| ?: return false | ||
| val fieldReferences = computedReference.type.expression.components<HasFieldReference<S>>() | ||
| return fieldReferences.size >= 3 | ||
| } | ||
|
|
||
| private fun <S>MongoshBackend.emitAccumulatedFields( | ||
| accumulatedFields: List<Node<S>>, | ||
| emitLongQuery: Boolean | ||
| ): MongoshBackend { | ||
| for (accumulatedField in accumulatedFields) { | ||
| val accumulator = accumulatedField.component<Named>() ?: continue | ||
| when (accumulator.name) { | ||
| Name.SUM, | ||
| Name.AVG, | ||
| Name.MIN, | ||
| Name.MAX, | ||
| Name.FIRST, | ||
| Name.LAST, | ||
| Name.PUSH, | ||
| Name.ADD_TO_SET -> { | ||
| emitKeyValueAccumulator( | ||
| accumulator, | ||
| accumulatedField, | ||
| emitLongQuery | ||
| ) | ||
| // "{ $group : { _id : null, totalCount : { $sum : 1 } | ||
| emitObjectValueEnd(long = emitLongQuery) | ||
| } | ||
| Name.TOP, | ||
| Name.TOP_N, | ||
| Name.BOTTOM, | ||
| Name.BOTTOM_N -> { | ||
| emitTopBottomAccumulator( | ||
| accumulator, | ||
| accumulatedField, | ||
| emitLongQuery | ||
| ) | ||
| // "{ $group : { _id : null, totalCount : { $top : { sortBy: { year: -1 }, "title" } } | ||
| emitObjectValueEnd(long = emitLongQuery) | ||
| } | ||
| else -> continue | ||
| } | ||
| } | ||
| return this | ||
| } | ||
|
|
||
| /** | ||
| * Emits for the following accumulators | ||
| * sum, avg, first, last, max, min, push, addToSet | ||
| */ | ||
| private fun <S>MongoshBackend.emitKeyValueAccumulator( | ||
| accumulator: Named, | ||
| accumulatedField: Node<S>, | ||
| emitLongQuery: Boolean, | ||
| ): MongoshBackend { | ||
| val fieldRef = accumulatedField.component<HasFieldReference<S>>() ?: return this | ||
| val valueRef = accumulatedField.component<HasValueReference<S>>() ?: return this | ||
|
|
||
| // "{ $group : { _id : null, totalCount : | ||
| emitObjectKey( | ||
| resolveFieldReference( | ||
| fieldRef = fieldRef, | ||
| fieldUsedAsValue = false, | ||
| ) | ||
| ) | ||
| // "{ $group : { _id : null, totalCount : { | ||
| emitObjectStart(long = emitLongQuery) | ||
| // "{ $group : { _id : null, totalCount : { $sum : | ||
| emitObjectKey(registerConstant('$' + accumulator.name.canonical)) | ||
| // "{ $group : { _id : null, totalCount : { $sum : 1 | ||
| emitContextValue(resolveValueReference(valueRef, fieldRef)) | ||
| // "{ $group : { _id : null, totalCount : { $sum : 1 } | ||
| emitObjectEnd(long = emitLongQuery) | ||
| return this | ||
| } | ||
|
|
||
| private fun <S>MongoshBackend.emitTopBottomAccumulator( | ||
| accumulator: Named, | ||
| accumulatedField: Node<S>, | ||
| emitLongQuery: Boolean, | ||
| ): MongoshBackend { | ||
| val fieldRef = accumulatedField.component<HasFieldReference<S>>() ?: return this | ||
| val valueRef = accumulatedField.component<HasValueReference<S>>() ?: return this | ||
| val sorts = accumulatedField.component<HasSorts<S>>()?.children ?: emptyList() | ||
| val limit = accumulatedField.component<HasLimit>()?.limit | ||
| emitObjectKey( | ||
| resolveFieldReference( | ||
| fieldRef = fieldRef, | ||
| fieldUsedAsValue = false, | ||
| ) | ||
| ) | ||
| // "{" | ||
| emitObjectStart(long = emitLongQuery) | ||
| // "{ $top : " | ||
| emitObjectKey(registerConstant('$' + accumulator.name.canonical)) | ||
| // "{ $top : {" | ||
| emitObjectStart(long = emitLongQuery) | ||
| // "{ $top : { "sortBy" : " | ||
| emitObjectKey(registerConstant("sortBy")) | ||
| // "{ $top : { "sortBy" : { " | ||
| emitObjectStart(long = emitLongQuery) | ||
| // "{ $top : { "sortBy" : { "field" : 1," | ||
| emitAsFieldValueDocument(sorts, emitLongQuery) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }" | ||
| emitObjectEnd(long = emitLongQuery) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, " | ||
| emitObjectValueEnd(long = emitLongQuery) | ||
|
|
||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : " | ||
| emitObjectKey(registerConstant("output")) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField"" | ||
| emitContextValue(resolveValueReference(valueRef, fieldRef)) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", " | ||
| emitObjectValueEnd(long = emitLongQuery) | ||
|
|
||
| if (limit != null) { | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", n : " | ||
| emitObjectKey(registerConstant("n")) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", n : 3" | ||
| emitContextValue(registerConstant(limit)) | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", n : 3, " | ||
| emitObjectValueEnd(long = emitLongQuery) | ||
| } | ||
|
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||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", } " or | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", n : 3, }" | ||
| emitObjectEnd(long = emitLongQuery) | ||
|
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||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", } }" or | ||
| // "{ $top : { "sortBy" : { "field" : 1, }, output : "$someField", n : 3, } }" | ||
| emitObjectEnd(long = emitLongQuery) | ||
| return this | ||
| } |
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