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HiveToStringVisitor.java
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115 lines (107 loc) · 3.54 KB
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package sqlancer.hive;
import sqlancer.common.ast.newast.NewToStringVisitor;
import sqlancer.common.ast.newast.TableReferenceNode;
import sqlancer.hive.ast.HiveCastOperation;
import sqlancer.hive.ast.HiveConstant;
import sqlancer.hive.ast.HiveExpression;
import sqlancer.hive.ast.HiveJoin;
import sqlancer.hive.ast.HiveSelect;
public class HiveToStringVisitor extends NewToStringVisitor<HiveExpression> {
@Override
public void visitSpecific(HiveExpression expr) {
if (expr instanceof HiveConstant) {
visit((HiveConstant) expr);
} else if (expr instanceof HiveSelect) {
visit((HiveSelect) expr);
} else if (expr instanceof HiveJoin) {
visit((HiveJoin) expr);
} else if (expr instanceof HiveCastOperation) {
visit((HiveCastOperation) expr);
} else {
throw new AssertionError(expr.getClass());
}
}
private void visit(HiveConstant constant) {
sb.append(constant.toString());
}
private void visit(HiveSelect select) {
sb.append("SELECT ");
if (select.isDistinct()) {
sb.append("DISTINCT ");
}
visit(select.getFetchColumns());
sb.append(" FROM ");
visit(select.getFromList());
if (!select.getFromList().isEmpty() && !select.getJoinList().isEmpty()) {
sb.append(", ");
}
if (!select.getJoinList().isEmpty()) {
visit(select.getJoinList());
}
if (select.getWhereClause() != null) {
sb.append(" WHERE ");
visit(select.getWhereClause());
}
if (!select.getGroupByExpressions().isEmpty()) {
sb.append(" GROUP BY ");
visit(select.getGroupByExpressions());
}
if (select.getHavingClause() != null) {
sb.append(" HAVING ");
visit(select.getHavingClause());
}
if (!select.getOrderByClauses().isEmpty()) {
sb.append(" ORDER BY ");
visit(select.getOrderByClauses());
}
if (select.getLimitClause() != null) {
sb.append(" LIMIT ");
visit(select.getLimitClause());
}
if (select.getOffsetClause() != null) {
sb.append(" OFFSET ");
visit(select.getOffsetClause());
}
}
private void visit(HiveJoin join) {
switch (join.getJoinType()) {
case INNER:
sb.append(" INNER JOIN ");
break;
case LEFT_OUTER:
sb.append(" LEFT JOIN ");
break;
case RIGHT_OUTER:
sb.append(" RIGHT JOIN ");
break;
case FULL_OUTER:
sb.append(" FULL JOIN ");
break;
case LEFT_SEMI:
sb.append(" LEFT SEMI JOIN ");
break;
case CROSS:
sb.append(" CROSS JOIN ");
break;
default:
throw new UnsupportedOperationException();
}
visit((TableReferenceNode<HiveExpression, HiveSchema.HiveTable>) join.getRightTable());
if (join.getOnClause() != null) {
sb.append(" ON ");
visit(join.getOnClause());
}
}
private void visit(HiveCastOperation cast) {
sb.append("CAST(");
visit(cast.getExpression());
sb.append(" AS ");
sb.append(cast.getType());
sb.append(")");
}
public static String asString(HiveExpression expr) {
HiveToStringVisitor visitor = new HiveToStringVisitor();
visitor.visit(expr);
return visitor.get();
}
}