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Support EXPLAIN, COPY DATABASE, PRAGMA #58

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edfcbe0
add PRAGMA STATEMENT
hmeriann Oct 30, 2025
3418db4
add Copy statement to generator
hmeriann Oct 31, 2025
9ccaa35
add copy database statement
hmeriann Oct 31, 2025
26fb2a8
start adding explain statement
hmeriann Nov 3, 2025
3513566
make in generate explain statement with Select and some other stateme…
hmeriann Nov 3, 2025
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3 changes: 3 additions & 0 deletions src/include/statement_generator.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,9 @@ class StatementGenerator {
unique_ptr<ParsedExpression> GenerateComparison();
unique_ptr<ParsedExpression> GeneratePositionalReference();
unique_ptr<ParsedExpression> GenerateCase();
unique_ptr<PragmaStatement> GeneratePragma();
unique_ptr<CopyDatabaseStatement> GenerateCopyDatabase();
unique_ptr<ExplainStatement> GenerateExplain();

unique_ptr<OrderModifier> GenerateOrderBy();
unique_ptr<OrderModifier> GenerateOrderByAll();
Expand Down
73 changes: 73 additions & 0 deletions src/statement_generator.cpp
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Expand Up @@ -13,14 +13,18 @@
#include "duckdb/parser/parsed_data/create_type_info.hpp"
#include "duckdb/parser/parsed_data/create_view_info.hpp"
#include "duckdb/parser/parsed_expression_iterator.hpp"
#include "duckdb/parser/statement/explain_statement.hpp"
#include "duckdb/parser/query_node/select_node.hpp"
#include "duckdb/parser/query_node/set_operation_node.hpp"
#include "duckdb/parser/statement/attach_statement.hpp"
#include "duckdb/parser/statement/create_statement.hpp"
#include "duckdb/parser/statement/copy_statement.hpp"
#include "duckdb/parser/statement/copy_database_statement.hpp"
#include "duckdb/parser/statement/delete_statement.hpp"
#include "duckdb/parser/statement/detach_statement.hpp"
#include "duckdb/parser/statement/insert_statement.hpp"
#include "duckdb/parser/statement/multi_statement.hpp"
#include "duckdb/parser/statement/pragma_statement.hpp"
#include "duckdb/parser/statement/select_statement.hpp"
#include "duckdb/parser/statement/set_statement.hpp"
#include "duckdb/parser/statement/update_statement.hpp"
Expand Down Expand Up @@ -106,12 +110,21 @@ unique_ptr<SQLStatement> StatementGenerator::GenerateStatement() {
if (RandomPercentage(60)) {
return GenerateStatement(StatementType::DETACH_STATEMENT);
}
if (RandomPercentage(50)) {
return GenerateStatement(StatementType::PRAGMA_STATEMENT);
}
if (RandomPercentage(30)) {
return GenerateStatement(StatementType::SET_STATEMENT);
}
if (RandomPercentage(40)) { // 20
return GenerateStatement(StatementType::DELETE_STATEMENT);
}
if (RandomPercentage(10)) {
return GenerateCopyDatabase();
}
if (RandomPercentage(20)) {
return GenerateStatement(StatementType::EXPLAIN_STATEMENT);
}
return GenerateStatement(StatementType::CREATE_STATEMENT);
}

Expand All @@ -130,6 +143,12 @@ unique_ptr<SQLStatement> StatementGenerator::GenerateStatement(StatementType typ
return GenerateSet();
case StatementType::DELETE_STATEMENT:
return GenerateDelete();
case StatementType::PRAGMA_STATEMENT:
return GeneratePragma();
case StatementType::COPY_DATABASE_STATEMENT:
return GenerateCopyDatabase();
case StatementType::EXPLAIN_STATEMENT:
return GenerateExplain();
default:
throw InternalException("Unsupported type");
}
Expand Down Expand Up @@ -200,6 +219,60 @@ unique_ptr<DeleteStatement> StatementGenerator::GenerateDelete() {
return delete_statement;
}

//===--------------------------------------------------------------------===//
// Generate Pragma
//===--------------------------------------------------------------------===//

unique_ptr<PragmaStatement> StatementGenerator::GeneratePragma() {
auto pragma_stmt = make_uniq<PragmaStatement>();
pragma_stmt->info = make_uniq<PragmaInfo>();
// getting a random pragma_function
if (!generator_context->pragma_functions.empty()) {
auto &entry = Choose(generator_context->pragma_functions).get();
pragma_stmt->info->name = entry.name;
} else {
pragma_stmt->info->name = "enable_progress_bar";
}
if (RandomPercentage(50)) {
pragma_stmt->info->parameters.push_back(GenerateConstant());
}
return pragma_stmt;
}

//===--------------------------------------------------------------------===//
// Copy Database Statement
//===--------------------------------------------------------------------===//

unique_ptr<CopyDatabaseStatement> StatementGenerator::GenerateCopyDatabase() {
auto from_db = GetRandomAttachedDataBase();
auto to_db = string("db_") + RandomString(6);
auto mode = RandomPercentage(50) ? CopyDatabaseType::COPY_SCHEMA : CopyDatabaseType::COPY_DATA;
return make_uniq<CopyDatabaseStatement>(std::move(from_db), std::move(to_db), mode);
}

//===--------------------------------------------------------------------===//
// Explain Statement
//===--------------------------------------------------------------------===//

unique_ptr<ExplainStatement> StatementGenerator::GenerateExplain() {
unique_ptr<SQLStatement> payload;
if (RandomPercentage(70)) {
payload = GenerateStatement(StatementType::SELECT_STATEMENT);
} else {
payload = GenerateStatement(Choose<StatementType>({
StatementType::DELETE_STATEMENT,
StatementType::UPDATE_STATEMENT,
StatementType::CREATE_STATEMENT
}));
}
auto stmt = make_uniq<ExplainStatement>(
std::move(payload),
ExplainType::EXPLAIN_STANDARD,
ExplainFormat::DEFAULT
);
return stmt;
}

//===--------------------------------------------------------------------===//
// Generate Detach Info
//===--------------------------------------------------------------------===//
Expand Down
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