Description

Transform data type from Vector to Columns.

Parameters

Name Description Type Required？ Default Value
handleInvalid Strategy to handle unseen token String “ERROR”
reservedCols Names of the columns to be retained in the output table String[] null
schemaStr Formatted schema String ✓
vectorCol Name of a vector column String ✓

Script Example

Code

  1. import numpy as np
  2. import pandas as pd
  5. data = np.array([['1', '{"f0":"1.0","f1":"2.0"}', '$3$0:1.0 1:2.0', 'f0:1.0,f1:2.0', '1.0,2.0', 1.0, 2.0],
  6. ['2', '{"f0":"4.0","f1":"8.0"}', '$3$0:4.0 1:8.0', 'f0:4.0,f1:8.0', '4.0,8.0', 4.0, 8.0]])
  8. df = pd.DataFrame({"row":data[:,0], "json":data[:,1], "vec":data[:,2], "kv":data[:,3], "csv":data[:,4], "f0":data[:,5], "f1":data[:,6]})
  9. data = dataframeToOperator(df, schemaStr="row string, json string, vec string, kv string, csv string, f0 double, f1 double",op_type="stream")
  12. op = VectorToColumnsStreamOp()\
  13.     .setVectorCol("vec")\
  14.     .setReservedCols(["row"]).setSchemaStr("f0 double, f1 double")\
  15.     .linkFrom(data)
  16. op.print()
  17. StreamOperator.execute()

Results

row f0 f1
1 1.0 2.0
2 4.0 8.0