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QuestDB is high performance SQL time series database
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.array;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.IntFunction;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

// This is a hack. pg_index.indkey in PG is an int vector. We have it as INT
// because we don't support array column type yet. Some metadata PG SQLs
// dereference this column as an array. We do not care, because composite indexes are
// not yet supported either
public class IntArrayDereferenceHackFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "[](II)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        return new StrArrayDereferenceFunction(args.getQuick(0), args.getQuick(1));
    }

    private static class StrArrayDereferenceFunction extends IntFunction implements BinaryFunction {
        private final Function arrayFunction;
        private final Function indexFunction;

        public StrArrayDereferenceFunction(Function arrayFunction, Function indexFunction) {
            this.arrayFunction = arrayFunction;
            this.indexFunction = indexFunction;
        }

        @Override
        public int getInt(Record rec) {
            return 0;
        }

        @Override
        public Function getLeft() {
            return arrayFunction;
        }

        @Override
        public Function getRight() {
            return indexFunction;
        }

        @Override
        public boolean isThreadSafe() {
            return true;
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val(arrayFunction).val('[').val(indexFunction).val(']');
        }
    }
}