Add preview for data sources
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waltersf commented
A recurrent problem with data sets upload is that users do not configure the properties and try to use the data in a workflow.
Adding a preview of data available after infer schema could help to identify common problems. More than this, we could force user to certify the data is OK before allowing him to use the data source in workflow.
In Limonero, we are going to add methods to allow preview data and a new attribute, is_ready, to indicate the data source can be used in workflows. if is_ready is false, data source will not appear in the list in Data Source operation.