public override object VisitResult_column([NotNull] SqlParser.Result_columnContext context)
{
ColumnExpression column = null;
if (context.GetText().EndsWith("*"))
{
var table = context.table_name() == null ? "" : context.table_name().GetText();
var tableMap = queryTableStack.Peek();
GetTableNameAlias(tableMap, table, out var tableName, out var tableAlias);
column = new ColumnExpression()
{
ColumnName = "*",
TableName = tableName,
TableAlias = tableAlias,
};
}
else
{
// in case of resut column it should only set alias, but not use alias.
var expr = (IExpression)VisitExpr(context.expr(), false);
if (expr is ColumnExpression)
{
column = expr as ColumnExpression;
}
else
{
column = new ColumnExpression
{
IsExpression = true,
ColumnName = context.expr().GetText(),
SubExpressions = new List <IExpression>
{
expr
}
};
}
if (context.column_alias() != null)
{
column.Alias = EscapeTableOrColumnName(context.column_alias().GetText());
var columnMap = queryColumnStack.Peek();
if (columnMap != null)
{
columnMap[column.Alias] = column;
}
}
}
return(column);
}
/// <summary>
/// Visit a parse tree produced by <see cref="SqlParser.result_column"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitResult_column([NotNull] SqlParser.Result_columnContext context)
{
return(VisitChildren(context));
}
