thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-23 08:02:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

More comments

Browse Source
This commit is contained in:
alesapin 2020-03-03 17:27:43 +03:00
parent d19e21ba19
commit 720d9e287a
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
dbms/src/Interpreters/evaluateMissingDefaults.cpp
View File

@ -32,14 +32,23 @@ static ASTPtr requiredExpressions(Block & block, const NamesAndTypesList & requi
{
/// expressions must be cloned to prevent modification by the ExpressionAnalyzer
auto column_default_expr = it->second.expression->clone();
/// Our default may depend on columns with ALIAS as default expr which not present in block
/// we can easily add them from column_defaults struct
RequiredSourceColumnsVisitor::Data columns_context;
RequiredSourceColumnsVisitor(columns_context).visit(column_default_expr);
NameSet required_columns_names = columns_context.requiredColumns();
for (const auto & required_column_name : required_columns_names)
{
/// If we have such default column and it's alias than we should
/// add it into default_expression_list
if (auto rit = column_defaults.find(required_column_name);
rit != column_defaults.end() && rit->second.kind == ColumnDefaultKind::Alias)
{
default_expr_list->children.emplace_back(setAlias(rit->second.expression->clone(), required_column_name));
}
}
auto cast_func = makeASTFunction("CAST", column_default_expr, std::make_shared<ASTLiteral>(column.type->getName()));
default_expr_list->children.emplace_back(setAlias(cast_func, it->first));