expressions select.ts

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  import {seq, Expression, altPrio, optPrio, plusPrio, ver, AlsoIn, verNotLang} from "../combi";
import {SQLIntoTable, SQLOrderBy, SQLIntoList, SQLSetOp} from ".";
import {Release, LanguageVersion} from "../../../version";
import {IStatementRunnable} from "../statement_runnable";
import {SQLIntoStructure} from "./sql_into_structure";
import {buildSelectCore, buildSelectSingleCore} from "./_select_core";
 
export class Select extends Expression {
  public getRunnable(): IStatementRunnable {
    const into = altPrio(SQLIntoTable, SQLIntoStructure, SQLIntoList);
 
    const standalone = altPrio(
      seq("SINGLE", optPrio(verNotLang(LanguageVersion.KeyUser, "FOR UPDATE")), buildSelectSingleCore(true)),
      buildSelectCore(true),
    );
 
    const unionTail = ver(Release.v750, plusPrio(SQLSetOp), {also: AlsoIn.OpenABAP});
    const chained = seq(buildSelectCore(false, false), unionTail, optPrio(SQLOrderBy), optPrio(into));
 
    return seq("SELECT", altPrio(chained, standalone));
  }
}