Renders an Apache ECharts Sankey diagram for visualising flow volumes between nodes.
ECHARTSSANKEY — set as ReportType in def_report.
def Render(self, Param1="", Param2="", Param3="") -> str:
Inherited from ObjReportEchartsbase. Param1, Param2, and Param3 are forwarded in the RPC payload for SQL token substitution. Returns an HTML string containing a styled panel and an ECharts initialisation script.
Uses the Apache ECharts JS library. The SQL query must return rows with three columns: source, target, and value. Node objects are derived automatically from the unique source and target names. Option building is handled by ObjReportEchartsbase._build_sankey_option.