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Change push down logic in VIEW (#11513)

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Artem Zuikov 2020-06-15 15:36:10 +03:00 committed by GitHub
parent 10566e2b43
commit 24059efad5
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14 changed files with 171 additions and 130 deletions
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4
src/Interpreters/CrossToInnerJoinVisitor.cpp
View File

@ -202,11 +202,11 @@ private:
{
std::optional<size_t> left_table_pos = IdentifierSemantic::getMembership(left);
if (!left_table_pos)
left_table_pos = IdentifierSemantic::chooseTable(left, tables);
left_table_pos = IdentifierSemantic::chooseTableColumnMatch(left, tables);
std::optional<size_t> right_table_pos = IdentifierSemantic::getMembership(right);
if (!right_table_pos)
right_table_pos = IdentifierSemantic::chooseTable(right, tables);
right_table_pos = IdentifierSemantic::chooseTableColumnMatch(right, tables);
if (left_table_pos && right_table_pos && (*left_table_pos != *right_table_pos))
{

28
src/Interpreters/IdentifierSemantic.cpp
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@ -16,7 +16,8 @@ namespace
{
template <typename T>
std::optional<size_t> tryChooseTable(const ASTIdentifier & identifier, const std::vector<T> & tables, bool allow_ambiguous)
std::optional<size_t> tryChooseTable(const ASTIdentifier & identifier, const std::vector<T> & tables,
bool allow_ambiguous, bool column_match [[maybe_unused]] = false)
{
using ColumnMatch = IdentifierSemantic::ColumnMatch;
@ -27,6 +28,13 @@ std::optional<size_t> tryChooseTable(const ASTIdentifier & identifier, const std
for (size_t i = 0; i < tables.size(); ++i)
{
auto match = IdentifierSemantic::canReferColumnToTable(identifier, tables[i]);
if constexpr (std::is_same_v<T, TableWithColumnNamesAndTypes>)
{
if (column_match && match == ColumnMatch::NoMatch && identifier.isShort() && tables[i].hasColumn(identifier.shortName()))
match = ColumnMatch::ColumnName;
}
if (match != ColumnMatch::NoMatch)
{
if (match > best_match)
@ -125,12 +133,17 @@ std::optional<size_t> IdentifierSemantic::chooseTable(const ASTIdentifier & iden
return tryChooseTable<DatabaseAndTableWithAlias>(identifier, tables, ambiguous);
}
std::optional<size_t> IdentifierSemantic::chooseTable(const ASTIdentifier & identifier, const std::vector<TableWithColumnNamesAndTypes> & tables,
bool ambiguous)
std::optional<size_t> IdentifierSemantic::chooseTable(const ASTIdentifier & identifier, const TablesWithColumns & tables, bool ambiguous)
{
return tryChooseTable<TableWithColumnNamesAndTypes>(identifier, tables, ambiguous);
}
std::optional<size_t> IdentifierSemantic::chooseTableColumnMatch(const ASTIdentifier & identifier, const TablesWithColumns & tables,
bool ambiguous)
{
return tryChooseTable<TableWithColumnNamesAndTypes>(identifier, tables, ambiguous, true);
}
StorageID IdentifierSemantic::extractDatabaseAndTable(const ASTIdentifier & identifier)
{
if (identifier.name_parts.size() > 2)
@ -191,14 +204,9 @@ IdentifierSemantic::ColumnMatch IdentifierSemantic::canReferColumnToTable(const
}
IdentifierSemantic::ColumnMatch IdentifierSemantic::canReferColumnToTable(const ASTIdentifier & identifier,
const TableWithColumnNamesAndTypes & db_and_table)
const TableWithColumnNamesAndTypes & table_with_columns)
{
ColumnMatch match = canReferColumnToTable(identifier, db_and_table.table);
#if 0
if (match == ColumnMatch::NoMatch && identifier.isShort() && db_and_table.hasColumn(identifier.shortName()))
match = ColumnMatch::ColumnName;
#endif
return match;
return canReferColumnToTable(identifier, table_with_columns.table);
}
/// Strip qualificators from left side of column name.

6
src/Interpreters/IdentifierSemantic.h
View File

@ -41,7 +41,7 @@ struct IdentifierSemantic
static std::optional<String> extractNestedName(const ASTIdentifier & identifier, const String & table_name);
static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const TableWithColumnNamesAndTypes & db_and_table);
static ColumnMatch canReferColumnToTable(const ASTIdentifier & identifier, const TableWithColumnNamesAndTypes & table_with_columns);
static void setColumnShortName(ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
static void setColumnLongName(ASTIdentifier & identifier, const DatabaseAndTableWithAlias & db_and_table);
@ -52,7 +52,9 @@ struct IdentifierSemantic
static std::optional<size_t> getMembership(const ASTIdentifier & identifier);
static std::optional<size_t> chooseTable(const ASTIdentifier &, const std::vector<DatabaseAndTableWithAlias> & tables,
bool allow_ambiguous = false);
static std::optional<size_t> chooseTable(const ASTIdentifier &, const std::vector<TableWithColumnNamesAndTypes> & tables,
static std::optional<size_t> chooseTable(const ASTIdentifier &, const TablesWithColumns & tables,
bool allow_ambiguous = false);
static std::optional<size_t> chooseTableColumnMatch(const ASTIdentifier &, const TablesWithColumns & tables,
bool allow_ambiguous = false);
private:

61
src/Interpreters/InterpreterExplainQuery.cpp
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@ -4,20 +4,15 @@
#include <DataStreams/OneBlockInputStream.h>
#include <DataTypes/DataTypeString.h>
#include <Interpreters/InDepthNodeVisitor.h>
#include <Interpreters/IdentifierSemantic.h>
#include <Interpreters/getTableExpressions.h>
#include <Interpreters/InterpreterSelectWithUnionQuery.h>
#include <Interpreters/InterpreterSelectQuery.h>
#include <Interpreters/Context.h>
#include <Parsers/DumpASTNode.h>
#include <Parsers/ASTSubquery.h>
#include <Parsers/queryToString.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTExplainQuery.h>
#include <Parsers/ASTTablesInSelectQuery.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/ASTSelectQuery.h>
#include <Core/Field.h>
#include <Common/typeid_cast.h>
#include <Storages/StorageView.h>
#include <sstream>
@ -31,56 +26,30 @@ namespace
{
struct Data
{
bool analyzed = false;
const Context & context;
};
static bool needChildVisit(ASTPtr &, ASTPtr &) { return true; }
static bool needChildVisit(ASTPtr & node, ASTPtr &)
{
return !node->as<ASTSelectQuery>();
}
static void visit(ASTPtr & ast, Data & data)
{
if (auto * select_query = ast->as<ASTSelectQuery>())
visit(*select_query, ast, data);
if (auto * union_select_query = ast->as<ASTSelectWithUnionQuery>())
visit(*union_select_query, ast, data);
if (auto * select = ast->as<ASTSelectQuery>())
visit(*select, ast, data);
}
static void visit(ASTSelectQuery & select_query, ASTPtr &, Data & data)
static void visit(ASTSelectQuery & select, ASTPtr & node, Data & data)
{
if (!select_query.tables())
return;
InterpreterSelectQuery interpreter(
node, data.context, SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify());
for (const auto & child : select_query.tables()->children)
const SelectQueryInfo & query_info = interpreter.getQueryInfo();
if (query_info.view_query)
{
auto * tables_element = child->as<ASTTablesInSelectQueryElement>();
if (tables_element && tables_element->table_expression)
visit(*tables_element->table_expression->as<ASTTableExpression>(), select_query, data);
}
}
static void visit(ASTSelectWithUnionQuery &, ASTPtr & node, Data & data)
{
if (!data.analyzed)
{
data.analyzed = true;
InterpreterSelectWithUnionQuery interpreter(
node, data.context, SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify());
}
}
static void visit(ASTTableExpression & expression, ASTSelectQuery & select_query, Data & data)
{
if (data.context.getSettingsRef().enable_optimize_predicate_expression && expression.database_and_table_name)
{
if (const auto * identifier = expression.database_and_table_name->as<ASTIdentifier>())
{
auto table_id = data.context.resolveStorageID(*identifier);
const auto & storage = DatabaseCatalog::instance().getTable(table_id, data.context);
if (auto * storage_view = dynamic_cast<StorageView *>(storage.get()))
storage_view->getRuntimeViewQuery(&select_query, data.context, true);
}
ASTPtr tmp;
StorageView::replaceWithSubquery(select, query_info.view_query->clone(), tmp);
}
}
};

58
src/Interpreters/InterpreterSelectQuery.cpp
View File

@ -30,6 +30,7 @@
#include <Storages/MergeTree/MergeTreeData.h>
#include <Storages/MergeTree/MergeTreeWhereOptimizer.h>
#include <Storages/IStorage.h>
#include <Storages/StorageView.h>
#include <TableFunctions/ITableFunction.h>
@ -186,6 +187,26 @@ static Context getSubqueryContext(const Context & context)
return subquery_context;
}
static void rewriteMultipleJoins(ASTPtr & query, const TablesWithColumns & tables, const String & database, const Settings & settings)
{
ASTSelectQuery & select = query->as<ASTSelectQuery &>();
Aliases aliases;
if (ASTPtr with = select.with())
QueryAliasesNoSubqueriesVisitor(aliases).visit(with);
QueryAliasesNoSubqueriesVisitor(aliases).visit(select.select());
CrossToInnerJoinVisitor::Data cross_to_inner{tables, aliases, database};
CrossToInnerJoinVisitor(cross_to_inner).visit(query);
size_t rewriter_version = settings.multiple_joins_rewriter_version;
if (!rewriter_version || rewriter_version > 2)
throw Exception("Bad multiple_joins_rewriter_version setting value: " + settings.multiple_joins_rewriter_version.toString(),
ErrorCodes::INVALID_SETTING_VALUE);
JoinToSubqueryTransformVisitor::Data join_to_subs_data{tables, aliases, rewriter_version};
JoinToSubqueryTransformVisitor(join_to_subs_data).visit(query);
}
InterpreterSelectQuery::InterpreterSelectQuery(
const ASTPtr & query_ptr_,
const Context & context_,
@ -242,29 +263,14 @@ InterpreterSelectQuery::InterpreterSelectQuery(
/// Rewrite JOINs
if (!has_input && joined_tables.tablesCount() > 1)
{
ASTSelectQuery & select = getSelectQuery();
rewriteMultipleJoins(query_ptr, joined_tables.tablesWithColumns(), context->getCurrentDatabase(), settings);
Aliases aliases;
if (ASTPtr with = select.with())
QueryAliasesNoSubqueriesVisitor(aliases).visit(with);
QueryAliasesNoSubqueriesVisitor(aliases).visit(select.select());
CrossToInnerJoinVisitor::Data cross_to_inner{joined_tables.tablesWithColumns(), aliases, context->getCurrentDatabase()};
CrossToInnerJoinVisitor(cross_to_inner).visit(query_ptr);
size_t rewriter_version = settings.multiple_joins_rewriter_version;
if (!rewriter_version || rewriter_version > 2)
throw Exception("Bad multiple_joins_rewriter_version setting value: " + settings.multiple_joins_rewriter_version.toString(),
ErrorCodes::INVALID_SETTING_VALUE);
JoinToSubqueryTransformVisitor::Data join_to_subs_data{joined_tables.tablesWithColumns(), aliases, rewriter_version};
JoinToSubqueryTransformVisitor(join_to_subs_data).visit(query_ptr);
joined_tables.reset(select);
joined_tables.reset(getSelectQuery());
joined_tables.resolveTables();
if (storage && joined_tables.isLeftTableSubquery())
{
/// Rewritten with subquery. Free storage here locks here.
/// Rewritten with subquery. Free storage locks here.
storage = {};
table_lock.release();
table_id = StorageID::createEmpty();
@ -288,12 +294,28 @@ InterpreterSelectQuery::InterpreterSelectQuery(
if (storage)
row_policy_filter = context->getRowPolicyCondition(table_id.getDatabaseName(), table_id.getTableName(), RowPolicy::SELECT_FILTER);
StorageView * view = nullptr;
if (storage)
view = dynamic_cast<StorageView *>(storage.get());
auto analyze = [&] (bool try_move_to_prewhere)
{
/// Allow push down and other optimizations for VIEW: replace with subquery and rewrite it.
ASTPtr view_table;
if (view)
view->replaceWithSubquery(getSelectQuery(), view_table);
syntax_analyzer_result = SyntaxAnalyzer(*context).analyzeSelect(
query_ptr, SyntaxAnalyzerResult(source_header.getNamesAndTypesList(), storage),
options, joined_tables.tablesWithColumns(), required_result_column_names, table_join);
if (view)
{
/// Restore original view name. Save rewritten subquery for future usage in StorageView.
query_info.view_query = view->restoreViewName(getSelectQuery(), view_table);
view = nullptr;
}
if (try_move_to_prewhere && storage && !row_policy_filter && query.where() && !query.prewhere() && !query.final())
{
/// PREWHERE optimization: transfer some condition from WHERE to PREWHERE if enabled and viable

2
src/Interpreters/InterpreterSelectQuery.h
View File

@ -88,6 +88,8 @@ public:
size_t getMaxStreams() const { return max_streams; }
const SelectQueryInfo & getQueryInfo() const { return query_info; }
private:
InterpreterSelectQuery(
const ASTPtr & query_ptr_,

3
src/Interpreters/JoinToSubqueryTransformVisitor.cpp
View File

@ -585,8 +585,9 @@ std::vector<TableNeededColumns> normalizeColumnNamesExtractNeeded(
for (ASTIdentifier * ident : identifiers)
{
bool got_alias = aliases.count(ident->name);
bool allow_ambiguous = got_alias; /// allow ambiguous column overridden by an alias
if (auto table_pos = IdentifierSemantic::chooseTable(*ident, tables))
if (auto table_pos = IdentifierSemantic::chooseTableColumnMatch(*ident, tables, allow_ambiguous))
{
if (!ident->isShort())
{

5
src/Interpreters/JoinedTables.h
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@ -34,7 +34,8 @@ public:
void makeFakeTable(StoragePtr storage, const Block & source_header);
std::shared_ptr<TableJoin> makeTableJoin(const ASTSelectQuery & select_query);
const std::vector<TableWithColumnNamesAndTypes> & tablesWithColumns() const { return tables_with_columns; }
const TablesWithColumns & tablesWithColumns() const { return tables_with_columns; }
TablesWithColumns moveTablesWithColumns() { return std::move(tables_with_columns); }
bool isLeftTableSubquery() const;
bool isLeftTableFunction() const;
@ -49,7 +50,7 @@ public:
private:
Context context;
std::vector<const ASTTableExpression *> table_expressions;
std::vector<TableWithColumnNamesAndTypes> tables_with_columns;
TablesWithColumns tables_with_columns;
/// Legacy (duplicated left table values)
ASTPtr left_table_expression;

2
src/Storages/SelectQueryInfo.h
View File

@ -1,6 +1,7 @@
#pragma once
#include <Interpreters/PreparedSets.h>
#include <Interpreters/DatabaseAndTableWithAlias.h>
#include <Core/SortDescription.h>
#include <Core/Names.h>
#include <memory>
@ -70,6 +71,7 @@ using ReadInOrderOptimizerPtr = std::shared_ptr<const ReadInOrderOptimizer>;
struct SelectQueryInfo
{
ASTPtr query;
ASTPtr view_query; /// Optimized VIEW query
SyntaxAnalyzerResultPtr syntax_analyzer_result;

78
src/Storages/StorageView.cpp
View File

@ -1,8 +1,6 @@
#include <Interpreters/InterpreterSelectQuery.h>
#include <Interpreters/InterpreterSelectWithUnionQuery.h>
#include <Interpreters/PredicateExpressionsOptimizer.h>
#include <Interpreters/Context.h>
#include <Interpreters/getTableExpressions.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTSubquery.h>
@ -30,7 +28,6 @@ namespace ErrorCodes
{
extern const int INCORRECT_QUERY;
extern const int LOGICAL_ERROR;
extern const int ALIAS_REQUIRED;
}
@ -60,9 +57,12 @@ Pipes StorageView::read(
Pipes pipes;
ASTPtr current_inner_query = inner_query;
if (context.getSettings().enable_optimize_predicate_expression)
current_inner_query = getRuntimeViewQuery(*query_info.query->as<const ASTSelectQuery>(), context);
if (query_info.view_query)
{
if (!query_info.view_query->as<ASTSelectWithUnionQuery>())
throw Exception("Unexpected optimized VIEW query", ErrorCodes::LOGICAL_ERROR);
current_inner_query = query_info.view_query->clone();
}
InterpreterSelectWithUnionQuery interpreter(current_inner_query, context, {}, column_names);
@ -87,60 +87,52 @@ Pipes StorageView::read(
return pipes;
}
ASTPtr StorageView::getRuntimeViewQuery(const ASTSelectQuery & outer_query, const Context & context)
static ASTTableExpression * getFirstTableExpression(ASTSelectQuery & select_query)
{
auto temp_outer_query = outer_query.clone();
auto * new_outer_select = temp_outer_query->as<ASTSelectQuery>();
return getRuntimeViewQuery(new_outer_select, context, false);
}
static void replaceTableNameWithSubquery(ASTSelectQuery * select_query, ASTPtr & subquery)
{
auto * select_element = select_query->tables()->children[0]->as<ASTTablesInSelectQueryElement>();
auto * select_element = select_query.tables()->children[0]->as<ASTTablesInSelectQueryElement>();
if (!select_element->table_expression)
throw Exception("Logical error: incorrect table expression", ErrorCodes::LOGICAL_ERROR);
auto * table_expression = select_element->table_expression->as<ASTTableExpression>();
return select_element->table_expression->as<ASTTableExpression>();
}
void StorageView::replaceWithSubquery(ASTSelectQuery & outer_query, ASTPtr view_query, ASTPtr & view_name)
{
ASTTableExpression * table_expression = getFirstTableExpression(outer_query);
if (!table_expression->database_and_table_name)
throw Exception("Logical error: incorrect table expression", ErrorCodes::LOGICAL_ERROR);
const auto alias = table_expression->database_and_table_name->tryGetAlias();
DatabaseAndTableWithAlias db_table(table_expression->database_and_table_name);
String alias = db_table.alias.empty() ? db_table.table : db_table.alias;
view_name = table_expression->database_and_table_name;
table_expression->database_and_table_name = {};
table_expression->subquery = std::make_shared<ASTSubquery>();
table_expression->subquery->children.push_back(subquery);
table_expression->children.push_back(table_expression->subquery);
if (!alias.empty())
table_expression->subquery->setAlias(alias);
table_expression->subquery->children.push_back(view_query);
table_expression->subquery->setAlias(alias);
for (auto & child : table_expression->children)
if (child.get() == view_name.get())
child = view_query;
}
ASTPtr StorageView::getRuntimeViewQuery(ASTSelectQuery * outer_query, const Context & context, bool normalize)
ASTPtr StorageView::restoreViewName(ASTSelectQuery & select_query, const ASTPtr & view_name)
{
auto runtime_view_query = inner_query->clone();
ASTTableExpression * table_expression = getFirstTableExpression(select_query);
/// TODO: remove getTableExpressions and getTablesWithColumns
{
const auto & table_expressions = getTableExpressions(*outer_query);
const auto & tables_with_columns = getDatabaseAndTablesWithColumns(table_expressions, context);
if (!table_expression->subquery)
throw Exception("Logical error: incorrect table expression", ErrorCodes::LOGICAL_ERROR);
replaceTableNameWithSubquery(outer_query, runtime_view_query);
if (context.getSettingsRef().joined_subquery_requires_alias && tables_with_columns.size() > 1)
{
for (const auto & pr : tables_with_columns)
if (pr.table.table.empty() && pr.table.alias.empty())
throw Exception("Not unique subquery in FROM requires an alias (or joined_subquery_requires_alias=0 to disable restriction).",
ErrorCodes::ALIAS_REQUIRED);
}
ASTPtr subquery = table_expression->subquery;
table_expression->subquery = {};
table_expression->database_and_table_name = view_name;
if (PredicateExpressionsOptimizer(context, tables_with_columns, context.getSettings()).optimize(*outer_query) && normalize)
InterpreterSelectWithUnionQuery(
runtime_view_query, context, SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify(), {});
}
return runtime_view_query;
for (auto & child : table_expression->children)
if (child.get() == subquery.get())
child = view_name;
return subquery->children[0];
}
void registerStorageView(StorageFactory & factory)

8
src/Storages/StorageView.h
View File

@ -29,9 +29,13 @@ public:
size_t max_block_size,
unsigned num_streams) override;
ASTPtr getRuntimeViewQuery(const ASTSelectQuery & outer_query, const Context & context);
void replaceWithSubquery(ASTSelectQuery & select_query, ASTPtr & view_name) const
{
replaceWithSubquery(select_query, inner_query->clone(), view_name);
}
ASTPtr getRuntimeViewQuery(ASTSelectQuery * outer_query, const Context & context, bool normalize);
static void replaceWithSubquery(ASTSelectQuery & outer_query, ASTPtr view_query, ASTPtr & view_name);
static ASTPtr restoreViewName(ASTSelectQuery & select_query, const ASTPtr & view_name);
private:
ASTPtr inner_query;

8
tests/queries/0_stateless/01076_predicate_optimizer_with_view.reference
View File

@ -1,4 +1,4 @@
SELECT \n date, \n id, \n name, \n value\nFROM \n(\n SELECT \n date, \n id, \n name, \n value\n FROM default.test\n WHERE id = 1\n)\nWHERE id = 1
SELECT \n date, \n id, \n name, \n value\nFROM \n(\n SELECT \n date, \n id, \n name, \n value\n FROM default.test\n WHERE id = 2\n)\nWHERE id = 2
SELECT id\nFROM \n(\n SELECT \n date, \n id, \n name, \n value\n FROM default.test\n WHERE id = 1\n)\nWHERE id = 1
SELECT id\nFROM \n(\n SELECT \n date, \n id, \n name, \n value\n FROM default.test\n WHERE id = 1\n) AS s\nWHERE id = 1
SELECT \n date, \n id, \n name, \n value\nFROM \n(\n SELECT *\n FROM default.test\n HAVING id = 1\n) AS test_view\nWHERE id = 1
SELECT \n date, \n id, \n name, \n value\nFROM \n(\n SELECT *\n FROM default.test\n HAVING id = 2\n) AS test_view\nWHERE id = 2
SELECT id\nFROM \n(\n SELECT *\n FROM default.test\n HAVING id = 1\n) AS test_view\nWHERE id = 1
SELECT id\nFROM \n(\n SELECT *\n FROM default.test\n HAVING id = 1\n) AS s\nWHERE id = 1

3
tests/queries/0_stateless/01144_join_rewrite_with_ambiguous_column_and_view.reference Normal file
View File

@ -0,0 +1,3 @@
1 1 1
2 2 0
1 val11 val21 val31

35
tests/queries/0_stateless/01144_join_rewrite_with_ambiguous_column_and_view.sql Normal file
View File

@ -0,0 +1,35 @@
DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;
DROP TABLE IF EXISTS t3;
DROP TABLE IF EXISTS view1;
CREATE TABLE t1 (id UInt32, value1 String) ENGINE MergeTree() ORDER BY id;
CREATE TABLE t2 (id UInt32, value2 String) ENGINE MergeTree() ORDER BY id;
CREATE TABLE t3 (id UInt32, value3 String) ENGINE MergeTree() ORDER BY id;
INSERT INTO t1 (id, value1) VALUES (1, 'val11');
INSERT INTO t2 (id, value2) VALUES (1, 'val21');
INSERT INTO t3 (id, value3) VALUES (1, 'val31');
SET multiple_joins_rewriter_version = 2;
SET enable_optimize_predicate_expression = 1;
SELECT t1.id, t2.id as id, t3.id as value
FROM (select number as id, 42 as value from numbers(4)) t1
LEFT JOIN (select number as id, 42 as value from numbers(3)) t2 ON t1.id = t2.id
LEFT JOIN (select number as id, 42 as value from numbers(2)) t3 ON t1.id = t3.id
WHERE id > 0 AND value < 42;
CREATE VIEW IF NOT EXISTS view1 AS
SELECT t1.id AS id, t1.value1 AS value1, t2.value2 AS value2, t3.value3 AS value3
FROM t1
LEFT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t1.id = t3.id
WHERE t1.id > 0;
SELECT * FROM view1 WHERE id = 1;
DROP TABLE IF EXISTS t1;
DROP TABLE IF EXISTS t2;
DROP TABLE IF EXISTS t3;
DROP TABLE IF EXISTS view1;