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package hive;
import gudusoft.gsqlparser.*;
import gudusoft.gsqlparser.nodes.*;
import gudusoft.gsqlparser.nodes.hive.THiveHintClause;
import gudusoft.gsqlparser.stmt.TSelectSqlStatement;
import junit.framework.TestCase;
public class testJoin extends TestCase {
public void testJoin(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvhive);
sqlparser.sqltext ="SELECT page_views.*\n" +
"FROM page_views JOIN dim_users\n" +
" ON (page_views.user_id = dim_users.id AND page_views.date >= '2008-03-01' AND page_views.date <= '2008-03-31')";
assertTrue(sqlparser.parse() == 0);
TSelectSqlStatement select = (TSelectSqlStatement)sqlparser.sqlstatements.get(0);
assertTrue(select.getResultColumnList().size() == 1);
assertTrue(select.joins.size() == 1);
TJoin join = select.joins.getJoin(0);
assertTrue(join.getKind() == TBaseType.join_source_table);
assertTrue(join.getTable().toString().equalsIgnoreCase("page_views"));
TJoinItem joinItem = join.getJoinItems().getJoinItem(0);
assertTrue(joinItem.getJoinType() == EJoinType.join);
assertTrue(joinItem.getTable().toString().equalsIgnoreCase("dim_users"));
TExpression joinCondition = joinItem.getOnCondition();
assertTrue(joinCondition.getExpressionType() == EExpressionType.parenthesis_t);
joinCondition = joinCondition.getLeftOperand();
assertTrue(joinCondition.getExpressionType() == EExpressionType.logical_and_t);
//System.out.println(joinCondition.toString());
}
public void test1(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvhive);
sqlparser.sqltext = "SELECT a.val, b.val, c.val FROM a JOIN b ON (a.key = b.key1) JOIN c ON (c.key = b.key2);";
assertTrue(sqlparser.parse() == 0);
TSelectSqlStatement select = (TSelectSqlStatement)sqlparser.sqlstatements.get(0);
assertTrue(select.joins.size() == 1);
TJoin join = select.joins.getJoin(0);
assertTrue(join.getKind() == TBaseType.join_source_table);
TTable table = join.getTable();
assertTrue(table.getTableType() == ETableSource.objectname);
assertTrue(table.getFullName().equalsIgnoreCase("a"));
assertTrue(join.getJoinItems().size() == 2);
TJoinItem joinItem = join.getJoinItems().getJoinItem(0);
assertTrue(joinItem.getTable().toString().equalsIgnoreCase("b"));
TJoinItem joinItem2 = join.getJoinItems().getJoinItem(1);
assertTrue(joinItem2.getJoinType() == EJoinType.join);
TExpression joinCondition = joinItem2.getOnCondition();
assertTrue(joinCondition.getExpressionType() == EExpressionType.parenthesis_t);
assertTrue(joinCondition.getLeftOperand().toString().equalsIgnoreCase("c.key = b.key2"));
}
public void test2(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvhive);
sqlparser.sqltext = "select /*+MAPJOIN(smallTableTwo)*/ idOne, idTwo, value FROM\n" +
" ( select /*+MAPJOIN(smallTableOne)*/ idOne, idTwo, value FROM\n" +
" bigTable JOIN smallTableOne on (bigTable.idOne = smallTableOne.idOne) \n" +
" ) firstjoin \n" +
" JOIN \n" +
" smallTableTwo on (firstjoin.idTwo = smallTableTwo.idTwo) ;";
assertTrue(sqlparser.parse() == 0);
TSelectSqlStatement select = (TSelectSqlStatement)sqlparser.sqlstatements.get(0);
assertTrue(select.joins.size() == 1);
TJoin join = select.joins.getJoin(0);
assertTrue(join.getKind() == TBaseType.join_source_table);
TTable table = join.getTable();
assertTrue(table.getTableType() == ETableSource.subquery);
TJoinItem joinItem = join.getJoinItems().getJoinItem(0);
assertTrue(joinItem.getJoinType() == EJoinType.join);
assertTrue(joinItem.getTable().getFullName().equalsIgnoreCase("smallTableTwo"));
// assertTrue(table.getFullName().equalsIgnoreCase("a"));
TSelectSqlStatement subquery = table.getSubquery();
THiveHintClause hintClause = subquery.getHiveHintClause();
assertTrue(hintClause.getHintList().getElement(0).getHintName().toString().equalsIgnoreCase("MAPJOIN"));
join = subquery.joins.getJoin(0);
assertTrue(join.getTable().getFullName().equalsIgnoreCase("bigTable"));
}
public void testLeftJoin(){
TGSqlParser sqlparser = new TGSqlParser(EDbVendor.dbvhive);
sqlparser.sqltext ="SELECT a.val1, a.val2, b.val, c.val\n" +
" FROM a\n" +
" JOIN b ON (a.KEY = b.KEY)\n" +
" LEFT OUTER JOIN c ON (a.KEY = c.KEY);";
assertTrue(sqlparser.parse() == 0);
TSelectSqlStatement select = (TSelectSqlStatement)sqlparser.sqlstatements.get(0);
assertTrue(select.getResultColumnList().size() == 4);
assertTrue(select.joins.size() == 1);
TJoin join = select.joins.getJoin(0);
assertTrue(join.getKind() == TBaseType.join_source_table);
assertTrue(join.getTable().toString().equalsIgnoreCase("a"));
TJoinItem joinItem = join.getJoinItems().getJoinItem(0);
assertTrue(joinItem.getJoinType() == EJoinType.join);
assertTrue(joinItem.getTable().toString().equalsIgnoreCase("b"));
TExpression joinCondition = joinItem.getOnCondition();
assertTrue(joinCondition.getExpressionType() == EExpressionType.parenthesis_t);
assertTrue(joinCondition.toString().equalsIgnoreCase("(a.KEY = b.KEY)"));
joinCondition = joinCondition.getLeftOperand();
assertTrue(joinCondition.getExpressionType() == EExpressionType.simple_comparison_t);
assertTrue(joinCondition.toString().equalsIgnoreCase("a.KEY = b.KEY"));
joinItem = join.getJoinItems().getJoinItem(1);
assertTrue(joinItem.getJoinType() == EJoinType.leftouter);
assertTrue(joinItem.getTable().toString().equalsIgnoreCase("c"));
joinCondition = joinItem.getOnCondition();
assertTrue(joinCondition.getExpressionType() == EExpressionType.parenthesis_t);
joinCondition = joinCondition.getLeftOperand();
assertTrue(joinCondition.getExpressionType() == EExpressionType.simple_comparison_t);
}
}