datafusion 7.0.0

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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//! Simple user defined logical plan node for testing

use std::{
    any::Any,
    fmt::{self, Debug},
    sync::Arc,
};

use crate::logical_plan::plan::Extension;
use crate::logical_plan::{DFSchemaRef, Expr, LogicalPlan, UserDefinedLogicalNode};

/// Create a new user defined plan node, for testing
pub fn new(input: LogicalPlan) -> LogicalPlan {
    let node = Arc::new(TestUserDefinedPlanNode { input });
    LogicalPlan::Extension(Extension { node })
}

struct TestUserDefinedPlanNode {
    input: LogicalPlan,
}

impl Debug for TestUserDefinedPlanNode {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.fmt_for_explain(f)
    }
}

impl UserDefinedLogicalNode for TestUserDefinedPlanNode {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn inputs(&self) -> Vec<&LogicalPlan> {
        vec![&self.input]
    }

    fn schema(&self) -> &DFSchemaRef {
        self.input.schema()
    }

    fn expressions(&self) -> Vec<Expr> {
        vec![]
    }

    fn fmt_for_explain(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "TestUserDefined")
    }

    fn from_template(
        &self,
        exprs: &[Expr],
        inputs: &[LogicalPlan],
    ) -> Arc<dyn UserDefinedLogicalNode + Send + Sync> {
        assert_eq!(inputs.len(), 1, "input size inconsistent");
        assert_eq!(exprs.len(), 0, "expression size inconsistent");
        Arc::new(TestUserDefinedPlanNode {
            input: inputs[0].clone(),
        })
    }
}