SubBinary.java

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package org.apache.doris.nereids.trees.expressions.functions.scalar;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.functions.PropagateNullable;
import org.apache.doris.nereids.trees.expressions.literal.Literal;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.IntegerType;
import org.apache.doris.nereids.types.VarBinaryType;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.Optional;

/**
 * ScalarFunction 'sub_binary'.
 */
public class SubBinary extends ScalarFunction
        implements ExplicitlyCastableSignature, PropagateNullable {
    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(VarBinaryType.INSTANCE).args(VarBinaryType.INSTANCE, IntegerType.INSTANCE),
            FunctionSignature.ret(VarBinaryType.INSTANCE)
                    .args(VarBinaryType.INSTANCE, IntegerType.INSTANCE, IntegerType.INSTANCE));

    /**
     * constructor with 2 arguments.
     */
    public SubBinary(Expression arg0, Expression arg1) {
        super("sub_binary", arg0, arg1, Literal.of(Integer.MAX_VALUE));
    }

    /**
     * constructor with 3 arguments.
     */
    public SubBinary(Expression arg0, Expression arg1, Expression arg2) {
        super("sub_binary", arg0, arg1, arg2);
    }

    /** constructor for withChildren and reuse signature */
    private SubBinary(ScalarFunctionParams functionParams) {
        super(functionParams);
    }

    public Expression getSource() {
        return child(0);
    }

    public Expression getPosition() {
        return child(1);
    }

    public Optional<Expression> getLength() {
        return arity() == 3 ? Optional.of(child(2)) : Optional.empty();
    }

    /**
     * withChildren.
     */
    @Override
    public SubBinary withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 2 || children.size() == 3);
        return new SubBinary(getFunctionParams(children));
    }

    @Override
    public List<FunctionSignature> getSignatures() {
        return SIGNATURES;
    }

    @Override
    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
        return visitor.visitSubBinary(this, context);
    }
}