private void IdentifyAndDeleteMissingEntries()
{
if (MergeMode == MergeMode.NoDeletions || MergeMode == MergeMode.OnlyUpdates)
{
return;
}
IEnumerable <TInput> deletions = null;
if (MergeMode == MergeMode.Delta)
{
deletions = InputData.Where(row => GetChangeAction(row) == ChangeAction.Delete).ToList();
}
else
{
deletions = InputData.Where(row => GetChangeAction(row) == null).ToList();
}
if (!UseTruncateMethod)
{
SqlDeleteIds(deletions);
}
foreach (var row in deletions) //.ForEach(row =>
{
SetChangeAction(row, ChangeAction.Delete);
SetChangeDate(row, DateTime.Now);
}
;
DeltaTable.AddRange(deletions);
}
private void IdentifyAndDeleteMissingEntries()
{
if (MergeMode == MergeMode.InsertsAndUpdatesOnly || MergeMode == MergeMode.UpdatesOnly)
{
return;
}
IEnumerable <TInput> deletions = null;
if (MergeMode == MergeMode.Delta)
{
deletions = InputData.Where(row => GetChangeAction(row) == ChangeAction.Delete).ToList();
}
else
{
deletions = InputData.Where(row => GetChangeAction(row) == null).ToList();
}
if (!UseTruncateMethod)
{
foreach (var batch in deletions.Batch(DbDestination.DEFAULT_BATCH_SIZE))
{
SqlDeleteIds(batch);
}
}
foreach (var row in deletions)
{
SetChangeAction(row, ChangeAction.Delete);
SetChangeDate(row, DateTime.Now);
}
;
DeltaTable.AddRange(deletions);
}
private void InitInternalFlow()
{
Lookup = new Lookup <TInput, TInput, TInput>(
row => UpdateRowWithDeltaInfo(row),
DestinationTableAsSource,
InputData
);
DestinationTable.BeforeBatchWrite = batch =>
{
DeleteMissingEntriesOnce();
DeltaTable.AddRange(batch);
if (!UseTruncateMethod)
{
SqlDeleteIds(batch.Where(row => row.ChangeAction != "I" && row.ChangeAction != "E"));
}
if (UseTruncateMethod)
{
return(batch.Where(row => row.ChangeAction == "I" || row.ChangeAction == "U" || row.ChangeAction == "E").ToArray());
}
else
{
return(batch.Where(row => row.ChangeAction == "I" || row.ChangeAction == "U").ToArray());
}
};
Lookup.LinkTo(DestinationTable);
}
void DeleteMissingEntriesOnce()
{
if (WasDeletionExecuted == true)
{
return;
}
WasDeletionExecuted = true;
if (DisableDeletion == true)
{
return;
}
var deletions = InputData.Where(row => String.IsNullOrEmpty(row.ChangeAction));
if (UseTruncateMethod)
{
TruncateTableTask.Truncate(this.ConnectionManager, TableName);
}
else
{
SqlDeleteIds(deletions);
}
DeltaTable.AddRange(deletions);
DeltaTable.ForEach(row =>
{
row.ChangeAction = "D";
row.ChangeDate = DateTime.Now;
});
}
private void SetOutputReadFunc()
{
OutputSource.ReadFunc = progressCount =>
{
return(DeltaTable.ElementAt(progressCount));
};
OutputSource.ReadingCompleted = progressCount => progressCount >= DeltaTable.Count;
}
public void TestSignaturesV3_0_X()
{
string tableName = "my_new_table";
_spark.Range(15).Write().Format("delta").SaveAsTable(tableName);
Assert.IsType <DeltaTable>(DeltaTable.ForName(tableName));
Assert.IsType <DeltaTable>(DeltaTable.ForName(_spark, tableName));
}
private void InitOutputFlow()
{
int x = 0;
OutputSource = new CustomSource <TInput>(() =>
{
return(DeltaTable.ElementAt(x++));
}, () => x >= DeltaTable.Count);
DestinationTable.OnCompletion = () => OutputSource.Execute();
}
private static void Main(string[] args)
{
var spark = SparkSession.Builder()
.Config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
.GetOrCreate();
if (!DeltaTable.IsDeltaTable("parquet.`/tmp/delta-demo`"))
{
spark.Range(1000).WithColumn("name", Lit("Sammy")).Write().Mode("overwrite")
.Parquet("/tmp/delta-demo");
DeltaTable.ConvertToDelta(spark, "parquet.`/tmp/delta-demo`");
}
var delta = DeltaTable.ForPath("/tmp/delta-demo");
delta.ToDF().OrderBy(Desc("Id")).Show();
spark.Range(5, 500).WithColumn("name", Lit("Lucy")).Write().Mode("append").Format("delta")
.Save("/tmp/delta-demo");
delta.Update(Expr("id > 500"), new Dictionary <string, Column>
{
{ "id", Lit(999) }
});
delta.Delete(Column("id").EqualTo(999));
spark.Range(100000, 100100).Write().Format("delta").Mode("append").Save("/tmp/delta-demo");
delta.History().Show(1000, 10000);
spark.Read().Format("delta").Option("versionAsOf", 0).Load("/tmp/delta-demo").OrderBy(Desc("Id"))
.Show();
spark.Read().Format("delta").Option("timestampAsOf", "2021-10-22 22:03:36")
.Load("/tmp/delta-demo").OrderBy(Desc("Id")).Show();
var newData = spark.Range(10).WithColumn("name", Lit("Ed"));
delta.Alias("target")
.Merge(newData.Alias("source"), "target.id = source.id")
.WhenMatched(newData["id"].Mod(2).EqualTo(0)).Update(new Dictionary <string, Column>
{
{ "name", newData["name"] }
})
.WhenMatched(newData["id"].Mod(2).EqualTo(1)).Delete()
.WhenNotMatched().InsertAll()
.Execute();
delta.ToDF().OrderBy("id").Show(1000, 10000);
delta.Vacuum(1F);
}
public void TestConvertToDelta()
{
string partitionColumnName = "id_plus_one";
DataFrame data = _spark.Range(0, 5).Select(
Functions.Col("id"),
Functions.Expr($"(`id` + 1) AS `{partitionColumnName}`"));
// Run the same test on the different overloads of DeltaTable.ConvertToDelta().
void testWrapper(
DataFrame dataFrame,
Func <string, DeltaTable> convertToDelta,
string partitionColumn = null)
{
using var tempDirectory = new TemporaryDirectory();
string path = Path.Combine(tempDirectory.Path, "parquet-data");
DataFrameWriter dataWriter = dataFrame.Write();
if (!string.IsNullOrEmpty(partitionColumn))
{
dataWriter = dataWriter.PartitionBy(partitionColumn);
}
dataWriter.Parquet(path);
Assert.False(DeltaTable.IsDeltaTable(path));
string identifier = $"parquet.`{path}`";
DeltaTable convertedDeltaTable = convertToDelta(identifier);
ValidateRangeDataFrame(Enumerable.Range(0, 5), convertedDeltaTable.ToDF());
Assert.True(DeltaTable.IsDeltaTable(path));
}
testWrapper(data, identifier => DeltaTable.ConvertToDelta(_spark, identifier));
testWrapper(
data.Repartition(Functions.Col(partitionColumnName)),
identifier => DeltaTable.ConvertToDelta(
_spark,
identifier,
$"{partitionColumnName} bigint"),
partitionColumnName);
testWrapper(
data.Repartition(Functions.Col(partitionColumnName)),
identifier => DeltaTable.ConvertToDelta(
_spark,
identifier,
new StructType(new[]
{
new StructField(partitionColumnName, new IntegerType())
})),
partitionColumnName);
}
public void TestIsDeltaTable()
{
using var tempDirectory = new TemporaryDirectory();
// Save the same data to a DeltaTable and to Parquet.
DataFrame data = _spark.Range(0, 5);
string parquetPath = Path.Combine(tempDirectory.Path, "parquet-data");
data.Write().Parquet(parquetPath);
string deltaTablePath = Path.Combine(tempDirectory.Path, "delta-table");
data.Write().Format("delta").Save(deltaTablePath);
Assert.False(DeltaTable.IsDeltaTable(parquetPath));
Assert.False(DeltaTable.IsDeltaTable(_spark, parquetPath));
Assert.True(DeltaTable.IsDeltaTable(deltaTablePath));
Assert.True(DeltaTable.IsDeltaTable(_spark, deltaTablePath));
}
void DeleteMissingEntriesOnce()
{
var deletions = InputData.Where(row => row.ChangeAction == 0);
if (DisableDeletion == false && WasDeletionExecuted == false)
{
if (UseTruncateMethod)
{
TruncateTableTask.Truncate(TableName);
}
else
{
SqlDeleteIds(deletions);
}
}
DeltaTable.AddRange(deletions);
DeltaTable.ForEach(row => {
row.ChangeAction = 'D';
row.ChangeDate = DateTime.Now;
});
WasDeletionExecuted = true;
}
public void TestStreamingScenario()
{
using var tempDirectory = new TemporaryDirectory();
// Write [0, 1, 2, 3, 4] to a Delta table.
string sourcePath = Path.Combine(tempDirectory.Path, "source-delta-table");
_spark.Range(0, 5).Write().Format("delta").Save(sourcePath);
// Create a stream from the source DeltaTable to the sink DeltaTable.
// To make the test synchronous and deterministic, we will use a series of
// "one-time micro-batch" triggers.
string sinkPath = Path.Combine(tempDirectory.Path, "sink-delta-table");
DataStreamWriter dataStreamWriter = _spark
.ReadStream()
.Format("delta")
.Load(sourcePath)
.WriteStream()
.Format("delta")
.OutputMode("append")
.Option("checkpointLocation", Path.Combine(tempDirectory.Path, "checkpoints"));
// Trigger the first stream batch
dataStreamWriter.Trigger(Trigger.Once()).Start(sinkPath).AwaitTermination();
// Now read the sink DeltaTable and validate its content.
DeltaTable sink = DeltaTable.ForPath(sinkPath);
ValidateRangeDataFrame(Enumerable.Range(0, 5), sink.ToDF());
// Write [5,6,7,8,9] to the source and trigger another stream batch.
_spark.Range(5, 10).Write().Format("delta").Mode("append").Save(sourcePath);
dataStreamWriter.Trigger(Trigger.Once()).Start(sinkPath).AwaitTermination();
// Finally, validate that the new data made its way to the sink.
ValidateRangeDataFrame(Enumerable.Range(0, 10), sink.ToDF());
}
public static void WriteToPublish(SparkSession spark, string rootPath, string publishPath)
{
var data = spark.Read().Parquet(rootPath);
var suppliers = data.Select(Col("Supplier")).Distinct()
.WithColumn("supplier_hash", Hash(Col("Supplier")));
var supplierPublishPath = $"{publishPath}-suppliers";
if (!Directory.Exists(supplierPublishPath))
{
suppliers.Write().Format("delta").Save(supplierPublishPath);
}
else
{
var existingSuppliers = spark.Read().Format("delta").Load(supplierPublishPath);
var newSuppliers = suppliers.Join(existingSuppliers,
existingSuppliers["Supplier"] == suppliers["Supplier"], "left_anti");
newSuppliers.Write().Mode(SaveMode.Append).Format("delta")
.Save(supplierPublishPath);
}
var expenseTypePublishPath = $"{publishPath}-expense-type";
var expenseType = data.Select(Col("Expense_Type")).Distinct()
.WithColumn("expense_type_hash", Hash(Col("Expense_Type")));
if (!Directory.Exists(expenseTypePublishPath))
{
expenseType.Write().Format("delta").Save(expenseTypePublishPath);
}
else
{
var existingExpenseType =
spark.Read().Format("delta").Load(expenseTypePublishPath);
var newExpenseType = expenseType.Join(existingExpenseType,
existingExpenseType["Expense_Type"] == expenseType["Expense_Type"],
"left_anti");
newExpenseType.Write().Mode(SaveMode.Append).Format("delta")
.Save(expenseTypePublishPath);
}
data = data.WithColumn("Expense_Type", Hash(Col("Expense_Type")))
.WithColumn("Supplier", Hash(Col("Supplier")));
if (!Directory.Exists(publishPath))
{
data.Write().Format("delta").Save(publishPath);
}
else
{
var target = DeltaTable.ForPath(publishPath).Alias("target");
target.Merge(
data.Alias("source"),
"source.Date = target.Date AND source.Expense_Type = target.Expense_Type AND source.Expense_Area = target.Expense_Area AND source.Supplier = target.supplier AND source.Reference = target.Reference"
).WhenMatched("source.Amount != target.Amount")
.Update(new Dictionary <string, Column> {
{ "Amount", data["Amount"] }
}
).WhenNotMatched()
.InsertAll()
.Execute();
}
}
private void SetDestinationTableProperties()
{
DestinationTable.ConnectionManager = ConnectionManager;
DestinationTable.TableName = TableName;
DestinationTable.BatchSize = BatchSize;
DestinationTable.MaxBufferSize = this.MaxBufferSize;
DestinationTable.BeforeBatchWrite = batch =>
{
if (MergeMode == MergeMode.Delta)
{
DeltaTable.AddRange(batch.Where(row => GetChangeAction(row) != ChangeAction.Delete));
}
else if (MergeMode == MergeMode.OnlyUpdates)
{
DeltaTable.AddRange(batch.Where(row => GetChangeAction(row) == ChangeAction.Exists ||
GetChangeAction(row) == ChangeAction.Update));
}
else
{
DeltaTable.AddRange(batch);
}
if (!UseTruncateMethod)
{
if (MergeMode == MergeMode.OnlyUpdates)
{
SqlDeleteIds(batch.Where(row => GetChangeAction(row) == ChangeAction.Update));
return(batch.Where(row => GetChangeAction(row) == ChangeAction.Update).ToArray());
}
else
{
SqlDeleteIds(batch.Where(row => GetChangeAction(row) != ChangeAction.Insert && GetChangeAction(row) != ChangeAction.Exists));
return(batch.Where(row => GetChangeAction(row) == ChangeAction.Insert ||
GetChangeAction(row) == ChangeAction.Update)
.ToArray());
}
}
else
{
if (MergeMode == MergeMode.Delta)
{
throw new ETLBoxNotSupportedException("If you provide a delta load, you must define at least one compare column." +
"Using the truncate method is not allowed. ");
}
TruncateDestinationOnce();
if (MergeMode == MergeMode.OnlyUpdates)
{
return(batch.Where(row => GetChangeAction(row) != ChangeAction.Delete &&
GetChangeAction(row) != ChangeAction.Insert).ToArray());
}
else
{
return(batch.Where(row => GetChangeAction(row) == ChangeAction.Insert ||
GetChangeAction(row) == ChangeAction.Update ||
GetChangeAction(row) == ChangeAction.Exists)
.ToArray());
}
}
};
DestinationTable.OnCompletion = () =>
{
IdentifyAndDeleteMissingEntries();
if (UseTruncateMethod && (MergeMode == MergeMode.OnlyUpdates || MergeMode == MergeMode.NoDeletions))
{
ReinsertTruncatedRecords();
}
if (Successors.Count > 0)
{
OutputSource.ExecuteAsync();
OutputSource.Completion.Wait();
//Careful: A TPL buffer never completes if it has no consumer linked to it!!!
OutputSource.BufferCompletion.Wait();
}
};
}
public string DeltaTest([FromServices] IAWSSettings awsSettings)
{
string result = String.Empty;
try
{
SparkSession spark = SparkSession
.Builder()
.AppName("DeltaTest")
.GetOrCreate();
string tempDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string dt = DateTime.Now.ToString("MMddhhmmss");
string path = Path.Combine(tempDirectory, $"delta-table{dt}");
// Write data to a Delta table.
DataFrame data = spark.Range(0, 5);
result += "Write data to a Delta table >> spark.Range(0, 5)" + " ";
foreach (var row in data.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
data.Write().Format("delta").Save(path);
// Create a second iteration of the table.
data = spark.Range(5, 10);
result += "Create a second iteration of the table >> spark.Range(0, 5)" + " ";
foreach (var row in data.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
data.Write().Format("delta").Mode("overwrite").Save(path);
// Load the data into a DeltaTable object.
DeltaTable deltaTable = DeltaTable.ForPath(path);
result += "Load the data into a DeltaTable object >> DeltaTable.ForPath" + " ";
foreach (var row in deltaTable.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
// Update every even value by adding 100 to it.
deltaTable.Update(
condition: Functions.Expr("id % 2 == 0"),
set: new Dictionary <string, Column>()
{
{ "id", Functions.Expr("id + 100") }
});
result += "Update every even value by adding 100 to it." + " ";
foreach (var row in deltaTable.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
// Delete every even value.
deltaTable.Delete(condition: Functions.Expr("id % 2 == 0"));
result += "Delete every even value id % 2 == 0" + " ";
foreach (var row in deltaTable.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
// Upsert (merge) new data.
DataFrame newData = spark.Range(0, 20).As("newData").ToDF();
result += "Upsert (merge) new data" + Environment.NewLine;
foreach (var row in newData.ToDF().Collect())
{
result += row.Values[0];
result += " | ";
}
result += " ";
deltaTable.As("oldData")
.Merge(newData, "oldData.id = newData.id")
.WhenMatched()
.Update(
new Dictionary <string, Column>()
{
{ "id", Functions.Col("newData.id") }
})
.WhenNotMatched()
.InsertExpr(new Dictionary <string, string>()
{
{ "id", "newData.id" }
})
.Execute();
spark.Stop();
}
catch (Exception ex)
{
result = ex.Message;
}
return(result);
}
public void TestTutorialScenario()
{
using var tempDirectory = new TemporaryDirectory();
string path = Path.Combine(tempDirectory.Path, "delta-table");
// Write data to a Delta table.
DataFrame data = _spark.Range(0, 5);
data.Write().Format("delta").Save(path);
// Validate that data contains the the sequence [0 ... 4].
ValidateRangeDataFrame(Enumerable.Range(0, 5), data);
// Create a second iteration of the table.
data = _spark.Range(5, 10);
data.Write().Format("delta").Mode("overwrite").Save(path);
// Load the data into a DeltaTable object.
DeltaTable deltaTable = DeltaTable.ForPath(path);
// Validate that deltaTable contains the the sequence [5 ... 9].
ValidateRangeDataFrame(Enumerable.Range(5, 5), deltaTable.ToDF());
// Update every even value by adding 100 to it.
deltaTable.Update(
condition: Functions.Expr("id % 2 == 0"),
set: new Dictionary <string, Column>()
{
{ "id", Functions.Expr("id + 100") }
});
// Validate that deltaTable contains the the data:
// +---+
// | id|
// +---+
// | 5|
// | 7|
// | 9|
// |106|
// |108|
// +---+
ValidateRangeDataFrame(
new List <int>()
{
5, 7, 9, 106, 108
},
deltaTable.ToDF());
// Delete every even value.
deltaTable.Delete(condition: Functions.Expr("id % 2 == 0"));
// Validate that deltaTable contains:
// +---+
// | id|
// +---+
// | 5|
// | 7|
// | 9|
// +---+
ValidateRangeDataFrame(new List <int>()
{
5, 7, 9
}, deltaTable.ToDF());
// Upsert (merge) new data.
DataFrame newData = _spark.Range(0, 20).As("newData").ToDF();
deltaTable.As("oldData")
.Merge(newData, "oldData.id = newData.id")
.WhenMatched()
.Update(
new Dictionary <string, Column>()
{
{ "id", Functions.Col("newData.id") }
})
.WhenNotMatched()
.InsertExpr(new Dictionary <string, string>()
{
{ "id", "newData.id" }
})
.Execute();
// Validate that the resulTable contains the the sequence [0 ... 19].
ValidateRangeDataFrame(Enumerable.Range(0, 20), deltaTable.ToDF());
}
public void TestSignatures()
{
using var tempDirectory = new TemporaryDirectory();
string path = Path.Combine(tempDirectory.Path, "delta-table");
DataFrame rangeRate = _spark.Range(15);
rangeRate.Write().Format("delta").Save(path);
DeltaTable table = Assert.IsType <DeltaTable>(DeltaTable.ForPath(path));
table = Assert.IsType <DeltaTable>(DeltaTable.ForPath(_spark, path));
Assert.IsType <bool>(DeltaTable.IsDeltaTable(_spark, path));
Assert.IsType <bool>(DeltaTable.IsDeltaTable(path));
Assert.IsType <DeltaTable>(table.As("oldTable"));
Assert.IsType <DeltaTable>(table.Alias("oldTable"));
Assert.IsType <DataFrame>(table.History());
Assert.IsType <DataFrame>(table.History(200));
Assert.IsType <DataFrame>(table.ToDF());
DataFrame newTable = _spark.Range(10, 15).As("newTable");
Assert.IsType <DeltaMergeBuilder>(
table.Merge(newTable, Functions.Exp("oldTable.id == newTable.id")));
DeltaMergeBuilder mergeBuilder = Assert.IsType <DeltaMergeBuilder>(
table.Merge(newTable, "oldTable.id == newTable.id"));
// Validate the MergeBuilder matched signatures.
Assert.IsType <DeltaMergeMatchedActionBuilder>(mergeBuilder.WhenMatched());
Assert.IsType <DeltaMergeMatchedActionBuilder>(mergeBuilder.WhenMatched("id = 5"));
DeltaMergeMatchedActionBuilder matchedActionBuilder =
Assert.IsType <DeltaMergeMatchedActionBuilder>(
mergeBuilder.WhenMatched(Functions.Expr("id = 5")));
Assert.IsType <DeltaMergeBuilder>(
matchedActionBuilder.Update(new Dictionary <string, Column>()));
Assert.IsType <DeltaMergeBuilder>(
matchedActionBuilder.UpdateExpr(new Dictionary <string, string>()));
Assert.IsType <DeltaMergeBuilder>(matchedActionBuilder.UpdateAll());
Assert.IsType <DeltaMergeBuilder>(matchedActionBuilder.Delete());
// Validate the MergeBuilder not-matched signatures.
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(mergeBuilder.WhenNotMatched());
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(
mergeBuilder.WhenNotMatched("id = 5"));
DeltaMergeNotMatchedActionBuilder notMatchedActionBuilder =
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(
mergeBuilder.WhenNotMatched(Functions.Expr("id = 5")));
Assert.IsType <DeltaMergeBuilder>(
notMatchedActionBuilder.Insert(new Dictionary <string, Column>()));
Assert.IsType <DeltaMergeBuilder>(
notMatchedActionBuilder.InsertExpr(new Dictionary <string, string>()));
Assert.IsType <DeltaMergeBuilder>(notMatchedActionBuilder.InsertAll());
// Update and UpdateExpr should return void.
table.Update(new Dictionary <string, Column>()
{
});
table.Update(Functions.Expr("id % 2 == 0"), new Dictionary <string, Column>()
{
});
table.UpdateExpr(new Dictionary <string, string>()
{
});
table.UpdateExpr("id % 2 == 1", new Dictionary <string, string>()
{
});
Assert.IsType <DataFrame>(table.Vacuum());
Assert.IsType <DataFrame>(table.Vacuum(168));
// Generate should return void.
table.Generate("symlink_format_manifest");
// Delete should return void.
table.Delete("id > 10");
table.Delete(Functions.Expr("id > 5"));
table.Delete();
// Load the table as a streaming source.
Assert.IsType <DataFrame>(_spark
.ReadStream()
.Format("delta")
.Option("path", path)
.Load());
Assert.IsType <DataFrame>(_spark.ReadStream().Format("delta").Load(path));
// Create Parquet data and convert it to DeltaTables.
string parquetIdentifier = $"parquet.`{path}`";
rangeRate.Write().Mode(SaveMode.Overwrite).Parquet(path);
Assert.IsType <DeltaTable>(DeltaTable.ConvertToDelta(_spark, parquetIdentifier));
rangeRate
.Select(Functions.Col("id"), Functions.Expr($"(`id` + 1) AS `id_plus_one`"))
.Write()
.PartitionBy("id")
.Mode(SaveMode.Overwrite)
.Parquet(path);
Assert.IsType <DeltaTable>(DeltaTable.ConvertToDelta(
_spark,
parquetIdentifier,
"id bigint"));
Assert.IsType <DeltaTable>(DeltaTable.ConvertToDelta(
_spark,
parquetIdentifier,
new StructType(new[]
{
new StructField("id", new IntegerType())
})));
}
public void TestSignatures()
{
using (var tempDirectory = new TemporaryDirectory())
{
string path = Path.Combine(tempDirectory.Path, "delta-table");
DataFrame rangeRate = _spark.Range(15);
rangeRate.Write().Format("delta").Save(path);
DeltaTable table = Assert.IsType <DeltaTable>(DeltaTable.ForPath(path));
table = Assert.IsType <DeltaTable>(DeltaTable.ForPath(_spark, path));
Assert.IsType <DeltaTable>(table.As("oldTable"));
Assert.IsType <DataFrame>(table.History());
Assert.IsType <DataFrame>(table.History(200));
Assert.IsType <DataFrame>(table.ToDF());
DataFrame newTable = _spark.Range(10, 15).As("newTable");
Assert.IsType <DeltaMergeBuilder>(
table.Merge(newTable, Functions.Exp("oldTable.id == newTable.id")));
DeltaMergeBuilder mergeBuilder = Assert.IsType <DeltaMergeBuilder>(
table.Merge(newTable, "oldTable.id == newTable.id"));
// Validate the MergeBuilder matched signatures.
Assert.IsType <DeltaMergeMatchedActionBuilder>(mergeBuilder.WhenMatched());
Assert.IsType <DeltaMergeMatchedActionBuilder>(mergeBuilder.WhenMatched("id = 5"));
DeltaMergeMatchedActionBuilder matchedActionBuilder =
Assert.IsType <DeltaMergeMatchedActionBuilder>(
mergeBuilder.WhenMatched(Functions.Expr("id = 5")));
Assert.IsType <DeltaMergeBuilder>(
matchedActionBuilder.Update(new Dictionary <string, Column>()));
Assert.IsType <DeltaMergeBuilder>(
matchedActionBuilder.UpdateExpr(new Dictionary <string, string>()));
Assert.IsType <DeltaMergeBuilder>(matchedActionBuilder.UpdateAll());
Assert.IsType <DeltaMergeBuilder>(matchedActionBuilder.Delete());
// Validate the MergeBuilder not-matched signatures.
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(mergeBuilder.WhenNotMatched());
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(
mergeBuilder.WhenNotMatched("id = 5"));
DeltaMergeNotMatchedActionBuilder notMatchedActionBuilder =
Assert.IsType <DeltaMergeNotMatchedActionBuilder>(
mergeBuilder.WhenNotMatched(Functions.Expr("id = 5")));
Assert.IsType <DeltaMergeBuilder>(
notMatchedActionBuilder.Insert(new Dictionary <string, Column>()));
Assert.IsType <DeltaMergeBuilder>(
notMatchedActionBuilder.InsertExpr(new Dictionary <string, string>()));
Assert.IsType <DeltaMergeBuilder>(notMatchedActionBuilder.InsertAll());
// Update and UpdateExpr should return void.
table.Update(new Dictionary <string, Column>()
{
});
table.Update(Functions.Expr("id % 2 == 0"), new Dictionary <string, Column>()
{
});
table.UpdateExpr(new Dictionary <string, string>()
{
});
table.UpdateExpr("id % 2 == 1", new Dictionary <string, string>()
{
});
Assert.IsType <DataFrame>(table.Vacuum());
Assert.IsType <DataFrame>(table.Vacuum(168));
// Delete should return void.
table.Delete("id > 10");
table.Delete(Functions.Expr("id > 5"));
table.Delete();
}
}