Navigate data previews

Data Preview is an integral component for pipeline design activities. After saving or validating a pipeline, you can preview the data that a Snap passes down the pipeline. You can navigate through the data preview of Snaps via a table or JSON views, and generate data visualizations from that data.

  1. Use the outer arrows at the bottom left of the data preview to navigate to the results for the next or the previous Snap:
    Outer navigation arrows at the bottom left of the data preview pane
  2. View data in error documents:

    If a Snap fails to validate, you can preview data from the failed Snap's error documents.

    Data preview showing error documents from a failed Snap
  3. Click the triangle at the top of the DataViz bar to display chart options:
    Collapsed DataViz bar with triangle to expand it Expanded DataViz panel showing Chart Type and Key to Visualize options
  4. For each data visualization type:
    OptionDescription
    Pie chart Select Pie Chart
    Line chart for numeric fields
    1. Select Line Chart
    2. For each line, select a numeric field key.
    Line chart over time
    1. For Chart Type, select Line Chart - Date as X axis.
    2. For X-axis (Date), select a temporal field (year, date, or time).
    3. Click Key to Visualize.
    4. Select the key for the y-axis values.

    Line chart with date as the x-axis, showing a yearly trend across three keys from the data:

    Line chart with date as the x-axis showing a yearly trend
    Bar chart to compare values
    1. Select Bar Chart - Count.
    2. Click Key to Visualize.
    3. Select the key field for the y-axis.
    Bar chart to aggregate data
    1. Select Bar Chart - Group and Count.
    2. For Category, select the target type.
    3. For Group By, select the field to aggregate.
    4. Hover over a bar to see the number of entries for that group key value.

    Bar chart with a group count showing the distribution of type against characteristic:

    Bar chart with group and count showing distribution by category
    Scatter chart
    1. Select Scatter Chart as the Chart Type.
    2. Select a data category from the X-axis and Y-axis dropdown menus.
    3. Optionally, select a data category from the Group By menu.
    4. Roll over or click a data point to view values. The header shows the value for the Group By field, and the X-axis and Y-axis values appear below, separated by a comma.
  5. Click the Close button to exit the data preview and return to the pipeline canvas.