MTMVPartitionExprFactory.java

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package org.apache.doris.mtmv;

import org.apache.doris.analysis.CastExpr;
import org.apache.doris.analysis.Expr;
import org.apache.doris.analysis.FunctionCallExpr;
import org.apache.doris.analysis.TimestampArithmeticExpr;
import org.apache.doris.common.AnalysisException;

import java.util.List;

/**
 * MTMV Partition Expr Factory
 */
public class MTMVPartitionExprFactory {
    public static MTMVPartitionExprService getExprService(Expr expr) throws AnalysisException {
        if (!(expr instanceof FunctionCallExpr)) {
            throw new AnalysisException("now async materialized view partition only support FunctionCallExpr");
        }
        FunctionCallExpr functionCallExpr = (FunctionCallExpr) expr;
        String fnName = functionCallExpr.getFnName().getFunction().toLowerCase();
        if ("date_trunc".equals(fnName)) {
            List<Expr> paramsExprs = functionCallExpr.getParams().exprs();
            Expr dateTruncArg = paramsExprs.size() >= 1 ? paramsExprs.get(0) : null;
            while (dateTruncArg instanceof CastExpr) {
                dateTruncArg = dateTruncArg.getChild(0);
            }
            if (paramsExprs.size() == 2 && dateTruncArg instanceof TimestampArithmeticExpr) {
                return new MTMVPartitionExprDateTruncDateAddSub(functionCallExpr);
            }
            return new MTMVPartitionExprDateTrunc(functionCallExpr);
        }
        throw new AnalysisException("async materialized view partition not support function name: " + fnName);
    }
}