LogicalPlanBuilderAssistant.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.parser;

import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;
import org.apache.doris.nereids.trees.expressions.literal.IntegerLiteral;
import org.apache.doris.nereids.trees.expressions.literal.LargeIntLiteral;
import org.apache.doris.nereids.trees.expressions.literal.Literal;
import org.apache.doris.nereids.trees.expressions.literal.SmallIntLiteral;
import org.apache.doris.nereids.trees.expressions.literal.TinyIntLiteral;
import org.apache.doris.nereids.trees.plans.logical.LogicalCheckPolicy;
import org.apache.doris.nereids.trees.plans.logical.LogicalPlan;

import java.math.BigInteger;

/**
 * Logical plan builder assistant for buildIn dialect and other dialect.
 * The same logical in {@link org.apache.doris.nereids.parser.LogicalPlanBuilder}
 * can be extracted to here.
 */
public class LogicalPlanBuilderAssistant {

    private LogicalPlanBuilderAssistant() {
    }

    /**
     * EscapeBackSlash such \n, \t
     */
    public static String escapeBackSlash(String str) {
        StringBuilder sb = new StringBuilder();
        int strLen = str.length();
        for (int i = 0; i < strLen; ++i) {
            char c = str.charAt(i);
            if (c == '\\' && (i + 1) < strLen) {
                switch (str.charAt(i + 1)) {
                    case 'n':
                        sb.append('\n');
                        break;
                    case 't':
                        sb.append('\t');
                        break;
                    case 'r':
                        sb.append('\r');
                        break;
                    case 'b':
                        sb.append('\b');
                        break;
                    case '0':
                        sb.append('\0'); // Ascii null
                        break;
                    case 'Z': // ^Z must be escaped on Win32
                        sb.append('\032');
                        break;
                    case '_':
                    case '%':
                        sb.append('\\'); // remember prefix for wildcard
                        sb.append(str.charAt(i + 1));
                        break;
                    default:
                        sb.append(str.charAt(i + 1));
                        break;
                }
                i++;
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * Handle Integer literal by BigInteger.
     */
    public static Literal handleIntegerLiteral(String value) {
        BigInteger bigInt = new BigInteger(value);
        if (BigInteger.valueOf(bigInt.byteValue()).equals(bigInt)) {
            return new TinyIntLiteral(bigInt.byteValue());
        } else if (BigInteger.valueOf(bigInt.shortValue()).equals(bigInt)) {
            return new SmallIntLiteral(bigInt.shortValue());
        } else if (BigInteger.valueOf(bigInt.intValue()).equals(bigInt)) {
            return new IntegerLiteral(bigInt.intValue());
        } else if (BigInteger.valueOf(bigInt.longValue()).equals(bigInt)) {
            return new BigIntLiteral(bigInt.longValueExact());
        } else {
            return new LargeIntLiteral(bigInt);
        }
    }

    /**
     * Wrap plan withCheckPolicy.
     */
    public static LogicalPlan withCheckPolicy(LogicalPlan plan) {
        return new LogicalCheckPolicy<>(plan);
    }
}