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package test.redshift;
import gudusoft.gsqlparser.EDbVendor;
import gudusoft.gsqlparser.ESqlStatementType;
import gudusoft.gsqlparser.TGSqlParser;
import gudusoft.gsqlparser.stmt.TCreateTableSqlStatement;
import gudusoft.gsqlparser.stmt.TExplainPlan;
import gudusoft.gsqlparser.stmt.TSelectSqlStatement;
import junit.framework.TestCase;
public class testExplain extends TestCase {
public void testSelect() {
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvredshift);
sqlparser.sqltext = "explain\n" +
"select eventid, eventname, event.venueid, venuename\n" +
"from event, venue\n" +
"where event.venueid = venue.venueid;";
assertTrue(sqlparser.parse() == 0);
assertTrue(sqlparser.sqlstatements.get(0).sqlstatementtype == ESqlStatementType.sstExplain);
TExplainPlan explainPlan = (TExplainPlan) sqlparser.sqlstatements.get(0);
assertTrue(explainPlan.getStatement().sqlstatementtype == ESqlStatementType.sstselect);
TSelectSqlStatement select = (TSelectSqlStatement)explainPlan.getStatement();
assertTrue(select.joins.getJoin(0).getTable().toString().equalsIgnoreCase("event"));
assertTrue(select.joins.getJoin(1).getTable().toString().equalsIgnoreCase("venue"));
}
public void testCreateTable() {
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvredshift);
sqlparser.sqltext = "explain create table venue_nonulls as\n" +
"select * from venue\n" +
"where venueseats is not null;";
assertTrue(sqlparser.parse() == 0);
assertTrue(sqlparser.sqlstatements.get(0).sqlstatementtype == ESqlStatementType.sstExplain);
TExplainPlan explainPlan = (TExplainPlan) sqlparser.sqlstatements.get(0);
assertTrue(explainPlan.getStatement().sqlstatementtype == ESqlStatementType.sstcreatetable);
TCreateTableSqlStatement createTable = (TCreateTableSqlStatement)explainPlan.getStatement();
assertTrue(createTable.getTableName().toString().equalsIgnoreCase("venue_nonulls"));
TSelectSqlStatement select = createTable.getSubQuery();
assertTrue(select.getWhereClause().getCondition().toString().equalsIgnoreCase("venueseats is not null"));
}
}