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package test;
import gudusoft.gsqlparser.EDbVendor;
import gudusoft.gsqlparser.ESqlStatementType;
import gudusoft.gsqlparser.TGSqlParser;
import gudusoft.gsqlparser.stmt.TExplainPlan;
import gudusoft.gsqlparser.stmt.TSelectSqlStatement;
import junit.framework.TestCase;
public class testExplain extends TestCase {
public void test1(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvvertica);
sqlparser.sqltext = "explain select a from t";
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.tables.getTable(0).toString().equalsIgnoreCase("t"));
}
public void testMySQL(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvmysql);
sqlparser.sqltext = "EXPLAIN EXTENDED SELECT 1 FROM t1 WHERE a = 18446744073709551615 AND TRIM(a) = b";
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.tables.getTable(0).toString().equalsIgnoreCase("t1"));
}
public void testHana(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvhana);
sqlparser.sqltext = "EXPLAIN PLAN SET STATEMENT_NAME = 'TPC-H Q10' FOR\n" +
" SELECT TOP 20\n" +
" c_custkey,\n" +
" c_name,\n" +
" SUM(l_extendedprice * (1 - l_discount)) AS revenue,\n" +
" c_acctbal,\n" +
" n_name,\n" +
" c_address,\n" +
" c_phone,\n" +
" c_comment\n" +
" FROM\n" +
" customer,\n" +
" orders,\n" +
" lineitem,\n" +
" nation\n" +
" WHERE\n" +
" c_custkey = o_custkey\n" +
" AND l_orderkey = o_orderkey\n" +
" AND o_orderdate >= '1993-10-01'\n" +
" AND o_orderdate < ADD_MONTHS('1993-10-01',3)\n" +
" AND l_returnflag = 'R'\n" +
" AND c_nationkey = n_nationkey\n" +
" GROUP BY\n" +
" c_custkey,\n" +
" c_name,\n" +
" c_acctbal,\n" +
" c_phone,\n" +
" n_name,\n" +
" c_address,\n" +
" c_comment\n" +
" ORDER BY\n" +
" revenue DESC;";
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.tables.getTable(0).toString().equalsIgnoreCase("customer"));
}
}