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4e76629aaf
- lots of static_cast - add safe_cast - types adjustments - config - IStorage::read/watch - ... - some TODO's (to convert types in future) P.S. That was quite a journey... v2: fixes after rebase v3: fix conflicts after #42308 merged Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
93 lines
3.5 KiB
C++
93 lines
3.5 KiB
C++
#include <Storages/ReadFinalForExternalReplicaStorage.h>
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#if USE_MYSQL || USE_LIBPQXX
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/TreeRewriter.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Processors/Transforms/FilterTransform.h>
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#include <Processors/QueryPlan/FilterStep.h>
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#include <Processors/QueryPlan/QueryPlan.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/InterpreterSelectQuery.h>
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namespace DB
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{
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bool needRewriteQueryWithFinalForStorage(const Names & column_names, const StoragePtr & storage)
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{
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const StorageMetadataPtr & metadata = storage->getInMemoryMetadataPtr();
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Block header = metadata->getSampleBlock();
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ColumnWithTypeAndName & version_column = header.getByPosition(header.columns() - 1);
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return std::find(column_names.begin(), column_names.end(), version_column.name) == column_names.end();
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}
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void readFinalFromNestedStorage(
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QueryPlan & query_plan,
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StoragePtr nested_storage,
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const Names & column_names,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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size_t num_streams)
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{
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NameSet column_names_set = NameSet(column_names.begin(), column_names.end());
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auto lock = nested_storage->lockForShare(context->getCurrentQueryId(), context->getSettingsRef().lock_acquire_timeout);
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const auto & nested_metadata = nested_storage->getInMemoryMetadataPtr();
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Block nested_header = nested_metadata->getSampleBlock();
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ColumnWithTypeAndName & sign_column = nested_header.getByPosition(nested_header.columns() - 2);
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String filter_column_name;
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Names require_columns_name = column_names;
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ASTPtr expressions = std::make_shared<ASTExpressionList>();
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if (column_names_set.empty() || !column_names_set.contains(sign_column.name))
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{
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require_columns_name.emplace_back(sign_column.name);
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const auto & sign_column_name = std::make_shared<ASTIdentifier>(sign_column.name);
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const auto & fetch_sign_value = std::make_shared<ASTLiteral>(Field(static_cast<Int8>(1)));
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expressions->children.emplace_back(makeASTFunction("equals", sign_column_name, fetch_sign_value));
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filter_column_name = expressions->children.back()->getColumnName();
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}
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auto nested_snapshot = nested_storage->getStorageSnapshot(nested_metadata, context);
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nested_storage->read(
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query_plan, require_columns_name, nested_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
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if (!query_plan.isInitialized())
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{
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InterpreterSelectQuery::addEmptySourceToQueryPlan(query_plan, nested_header, query_info, context);
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return;
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}
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query_plan.addTableLock(lock);
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query_plan.addStorageHolder(nested_storage);
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if (!expressions->children.empty())
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{
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const auto & header = query_plan.getCurrentDataStream().header;
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auto syntax = TreeRewriter(context).analyze(expressions, header.getNamesAndTypesList());
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auto actions = ExpressionAnalyzer(expressions, syntax, context).getActionsDAG(true /* add_aliases */, false /* project_result */);
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auto step = std::make_unique<FilterStep>(
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query_plan.getCurrentDataStream(),
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actions,
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filter_column_name,
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false);
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step->setStepDescription("Filter columns");
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query_plan.addStep(std::move(step));
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}
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}
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}
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#endif
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