private static boolean hasTableAlias(JoinTypeCheckCtx ctx, String tabName, ASTNode expr)
throws SemanticException {
int tblAliasCnt = 0;
for (RowResolver rr : ctx.getInputRRList()) {
if (rr.hasTableAlias(tabName)) tblAliasCnt++;
}
if (tblAliasCnt > 1) {
throw new SemanticException(ErrorMsg.AMBIGUOUS_TABLE_OR_COLUMN.getMsg(expr));
}
return (tblAliasCnt == 1) ? true : false;
}
private static ColumnInfo getColInfo(
JoinTypeCheckCtx ctx, String tabName, String colAlias, ASTNode expr)
throws SemanticException {
ColumnInfo tmp;
ColumnInfo cInfoToRet = null;
for (RowResolver rr : ctx.getInputRRList()) {
tmp = rr.get(tabName, colAlias);
if (tmp != null) {
if (cInfoToRet != null) {
throw new SemanticException(ErrorMsg.AMBIGUOUS_TABLE_OR_COLUMN.getMsg(expr));
}
cInfoToRet = tmp;
}
}
return cInfoToRet;
}
