private void init(JsonNode operatorJson, BlockSchema inputSchema) {
JsonNode exprListNode = operatorJson.get("genExpressions");
Iterator<JsonNode> it = exprListNode.getElements();
while (it.hasNext()) {
JsonNode expr = it.next();
String colName = expr.get("col").getTextValue();
int columnId = inputSchema.getIndex(colName);
flattenColumnNameSet.add(colName);
columnIndexArray.add(columnId);
if (expr.has("flatten")) {
final String flattenTypeStr = expr.get("flatten").getTextValue();
flattenPositions.put(inputSchema.getIndex(colName), FlattenType.fromString(flattenTypeStr));
odometerIterators.add(null);
// Extract output column definition from 'expr'
List<ColumnType> outputColumTypeList = new ArrayList<ColumnType>();
inputColumnIndexToOutputTypes.put(columnId, outputColumTypeList);
JsonNode outputNode = expr.get("output");
for (JsonNode j : outputNode) {
String outColName = j.get("col").getTextValue();
DataType outType = DataType.valueOf(j.get("type").getTextValue());
outputColumTypeList.add(new ColumnType(outColName, outType));
}
}
}
this.outSchema = generateOutSchema(inputSchema);
}
public static FlattenType fromString(String s) throws IllegalArgumentException {
for (FlattenType ftype : FlattenType.values()) {
if (s.equalsIgnoreCase(ftype.toString())) return ftype;
}
throw new IllegalArgumentException("Unmatched FlattenType");
}