LLMGenerate.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.trees.expressions.functions.llm;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.literal.StringLiteral;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.StringType;
import org.apache.doris.nereids.types.VarcharType;

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

import java.util.List;

/**
 * LLM function 'LLM_Generate'
 */
public class LLMGenerate extends LLMFunction {
    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(StringType.INSTANCE).args(StringType.INSTANCE),
            FunctionSignature.ret(StringType.INSTANCE).args(VarcharType.SYSTEM_DEFAULT),
            FunctionSignature.ret(StringType.INSTANCE)
                    .args(StringType.INSTANCE, StringType.INSTANCE),
            FunctionSignature.ret(StringType.INSTANCE)
                    .args(VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT)
    );

    /**
     * constructor with 1 argument.
     */
    public LLMGenerate(Expression arg) {
        this(new StringLiteral(getResourceName()), arg);
    }

    /**
     * constructor with 2 argument.
     */
    public LLMGenerate(Expression arg0, Expression arg1) {
        super("llm_generate", arg0, arg1);
    }

    @Override
    public LLMGenerate withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 1 || children.size() == 2,
                "LLM_GENERATE only accepts 1 or 2 arguments");
        if (children.size() == 1) {
            return new LLMGenerate(new StringLiteral(getResourceName()),
                    children.get(0));
        }
        return new LLMGenerate(children.get(0), children.get(1));
    }

    @Override
    public int getMaxArgsNum() {
        return 2;
    }

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

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