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  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
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<#assign dataSource = dataSources?values[0]>
<#assign csvParser = tools.csv.parse(dataSource, tools.csv.formats.DATAFRAME)>
<#assign users = tools.dataframe.fromCSVParser(csvParser)>

Original Data
=============================================================================
${tools.dataframe.print(users)}

Select By Age
=============================================================================
${tools.dataframe.print(users.select("(age > 40)"))}

Select By Name & Country
=============================================================================
<#assign country = "Germany">
${tools.dataframe.print(users
.select("(name == 'Schmitt' || name == 'Meier') && country == '${country}'")
.sort("name", tools.dataframe.sortOrder.ASCENDING))}

Head of Users
=============================================================================
${tools.dataframe.print(users.head(2))}

Count Column Values
=============================================================================
${tools.dataframe.print(users.getColumn("country").transform(tools.dataframe.transformer.COUNT))}

Group By Age & Country
=============================================================================
${tools.dataframe.print(users.groupBy("country", "age").sort("country"))}