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# DFE での Gremlin ステップカバレッジ
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 Gremlin DFE はラボモード機能であり、クラスターパラメータを有効にするか、`Neptune#useDFE` クエリヒントを使用することによって使用できます。詳細については、「[Neptune DFE クエリエンジンでの Gremlin の使用](https://docs.aws.amazon.com//neptune/latest/userguide/gremlin-with-dfe.html)」を参照してください。

 次の手順は Gremlin DFE で使用できます。

## パスとトラバーサルステップ:
<a name="DFE-path-and-traversal"></a>

 [asDate()](https://tinkerpop.apache.org/docs/current/reference/#asDate-step), [barrier()](https://tinkerpop.apache.org/docs/current/reference/#barrier-step), [call()](https://tinkerpop.apache.org/docs/current/reference/#call-step), [cap()](https://tinkerpop.apache.org/docs/current/reference/#cap-step), [dateAdd()](https://tinkerpop.apache.org/docs/current/reference/#dateadd-step), [dateDiff()](https://tinkerpop.apache.org/docs/current/reference/#datediff-step), [disjunct()](https://tinkerpop.apache.org/docs/current/reference/#disjunct-step), [drop()](https://tinkerpop.apache.org/docs/current/reference/#drop-step), [fail()](https://tinkerpop.apache.org/docs/current/reference/#fail-step), [filter()](https://tinkerpop.apache.org/docs/current/reference/#filter-step), [flatMap()](https://tinkerpop.apache.org/docs/current/reference/#flatmap-step), [id()](https://tinkerpop.apache.org/docs/current/reference/#id-step), [identity()](https://tinkerpop.apache.org/docs/current/reference/#identity-step), [index()](https://tinkerpop.apache.org/docs/current/reference/#index-step), [intersect()](https://tinkerpop.apache.org/docs/current/reference/#intersect-step), [inject()](https://tinkerpop.apache.org/docs/current/reference/#inject-step), [label()](https://tinkerpop.apache.org/docs/current/reference/#label-step), [length()](https://tinkerpop.apache.org/docs/current/reference/#length-step), [loops()](https://tinkerpop.apache.org/docs/current/reference/#loops-step), [map()](https://tinkerpop.apache.org/docs/current/reference/#map-step), [order()](https://tinkerpop.apache.org/docs/current/reference/#order-step), [order(local)](https://tinkerpop.apache.org/docs/current/reference/#order-step), [path()](https://tinkerpop.apache.org/docs/current/reference/#path-step), [project()](https://tinkerpop.apache.org/docs/current/reference/#project-step), [range()](https://tinkerpop.apache.org/docs/current/reference/#range-step), [repeat()](https://tinkerpop.apache.org/docs/current/reference/#repeat-step), [reverse()](https://tinkerpop.apache.org/docs/current/reference/#reverse-step), [sack()](https://tinkerpop.apache.org/docs/current/reference/#sack-step), [sample()](https://tinkerpop.apache.org/docs/current/reference/#sample-step), [select()](https://tinkerpop.apache.org/docs/current/reference/#select-step), [sideEffect()](https://tinkerpop.apache.org/docs/current/reference/#sideeffect-step), [split()](https://tinkerpop.apache.org/docs/current/reference/#split-step), [unfold()](https://tinkerpop.apache.org/docs/current/reference/#unfold-step), [union()](https://tinkerpop.apache.org/docs/current/reference/#union-step) 

## 集約と収集のステップ:
<a name="DFE-aggregate-and-collection"></a>

 [aggregate(global)](https://tinkerpop.apache.org/docs/current/reference/#aggregate-step)、 [combine()](https://tinkerpop.apache.org/docs/current/reference/#combine-step)、[count()](https://tinkerpop.apache.org/docs/current/reference/#count-step)、[dedup()](https://tinkerpop.apache.org/docs/current/reference/#dedup-step)、[dedup(local)](https://tinkerpop.apache.org/docs/current/reference/#dedup-step)、[fold()](https://tinkerpop.apache.org/docs/current/reference/#fold-step)、[group()](https://tinkerpop.apache.org/docs/current/reference/#group-step)、[groupCount()](https://tinkerpop.apache.org/docs/current/reference/#groupcount-step)、

## 数学的なステップ:
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 [max()](https://tinkerpop.apache.org/docs/current/reference/#max-step)、[mean()](https://tinkerpop.apache.org/docs/current/reference/#mean-step)、[min()](https://tinkerpop.apache.org/docs/current/reference/#min-step)、[sum()](https://tinkerpop.apache.org/docs/current/reference/#sum-step) 

## 要素ステップ:
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 [otherV()](https://tinkerpop.apache.org/docs/current/reference/#otherv-step)、[elementMap()](https://tinkerpop.apache.org/docs/current/reference/#elementmap-step)、[element()](https://tinkerpop.apache.org/docs/current/reference/#element-step)、[v()](https://tinkerpop.apache.org/docs/current/reference/#graph-step)、[ out()、in()、both()、outE()、inE()、bothE()、outV()、inV()、bothV()、otherV()](https://tinkerpop.apache.org/docs/current/reference/#vertex-step) 

## プロパティステップ:
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 [properties()](https://tinkerpop.apache.org/docs/current/reference/#properties-step)、[key()](https://tinkerpop.apache.org/docs/current/reference/#key-step)、[valueMap()](https://tinkerpop.apache.org/docs/current/reference/#propertymap-step)、[value()](https://tinkerpop.apache.org/docs/current/reference/#value-step) 

## フィルターステップ:
<a name="DFE-filter"></a>

 [and()](https://tinkerpop.apache.org/docs/current/reference/#and-step)、[coalesce()](https://tinkerpop.apache.org/docs/current/reference/#coalesce-step)、[coin()](https://tinkerpop.apache.org/docs/current/reference/#coin-step)、[has()](https://tinkerpop.apache.org/docs/current/reference/#has-step)、[is()](https://tinkerpop.apache.org/docs/current/reference/#is-step)、[local()](https://tinkerpop.apache.org/docs/current/reference/#local-step)、[none()](https://tinkerpop.apache.org/docs/current/reference/#none-step)、[not()](https://tinkerpop.apache.org/docs/current/reference/#not-step)、[or()](https://tinkerpop.apache.org/docs/current/reference/#or-step)、[where()](https://tinkerpop.apache.org/docs/current/reference/#where-step) 

## 文字列操作ステップ:
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 [concat()](https://tinkerpop.apache.org/docs/current/reference/#concat-step)、[lTrim()](https://tinkerpop.apache.org/docs/current/reference/#lTrim-step)、[rTrim()](https://tinkerpop.apache.org/docs/current/reference/#rtrim-step)、[substring()](https://tinkerpop.apache.org/docs/current/reference/#substring-step)、[toLower()](https://tinkerpop.apache.org/docs/current/reference/#toLower-step)、[toUpper()](https://tinkerpop.apache.org/docs/current/reference/#toUpper-step)、[trim()](https://tinkerpop.apache.org/docs/current/reference/#trim-step) 

## 述語:
<a name="DFE-predicates"></a>
+  [比較: eq、neq、lt、lte、gt、gte](https://tinkerpop.apache.org/docs/current/reference/#a-note-on-predicates) 
+  [包含: within、without](https://tinkerpop.apache.org/docs/current/reference/#a-note-on-predicates) 
+  [TextP: endingWith、containing、notStartingWith、notEndingWith、notContaining](https://tinkerpop.apache.org/docs/current/reference/#a-note-on-predicates) 
+  [P: and、or、between、outside、inside](https://tinkerpop.apache.org/docs/current/reference/#a-note-on-predicates) 

## 制限事項
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 制限付きで繰り返し、繰り返しトラバーサルと重複排除内のラベルは DFE ではまだサポートされていません。

```
// With Limit inside the repeat traversal
  g.V().has('code','AGR').repeat(out().limit(5)).until(has('code','FRA'))
  
  // With Labels inside the repeat traversal
  g.V().has('code','AGR').repeat(out().as('a')).until(has('code','FRA'))
  
  // With Dedup inside the repeat traversal
  g.V().has('code','AGR').repeat(out().dedup()).until(has('code','FRA'))
```

 ネストされた繰り返しを含むパス、または分岐ステップはまだサポートされていません。

```
// Path with branching steps
  g.V().has('code','AGR').union(identity, outE().inV()).path().by('code')
  
  
  // With nested repeat
  g.V().has('code','AGR').repeat(out().union(identity(), out())).path().by('code')
```