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s3select.h
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s3select.h
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#ifndef __S3SELECT__
#define __S3SELECT__
#define BOOST_SPIRIT_THREADSAFE
#define CSV_IO_NO_THREAD
#pragma once
#define BOOST_BIND_GLOBAL_PLACEHOLDERS
#include <boost/spirit/include/classic_core.hpp>
#include <boost/algorithm/string.hpp>
#include <iostream>
#include <string>
#include <list>
#include <deque>
#include "s3select_oper.h"
#include "s3select_functions.h"
#include "s3select_csv_parser.h"
#include "s3select_json_parser.h"
#include <boost/function.hpp>
#include <boost/bind.hpp>
#include <functional>
#include <unordered_set>
#define _DEBUG_TERM {string token(a,b);std::cout << __FUNCTION__ << token << std::endl;}
namespace s3selectEngine
{
/// AST builder
class s3select_projections
{
private:
std::vector<base_statement*> m_projections;
public:
std::vector<base_statement*>* get()
{
return &m_projections;
}
};
static s3select_reserved_word g_s3select_reserve_word;//read-only
struct actionQ
{
// upon parser is accepting a token (lets say some number),
// it push it into dedicated queue, later those tokens are poped out to build some "higher" contruct (lets say 1 + 2)
// those containers are used only for parsing phase and not for runtime.
std::vector<mulldiv_operation::muldiv_t> muldivQ;
std::vector<addsub_operation::addsub_op_t> addsubQ;
std::vector<arithmetic_operand::cmp_t> arithmetic_compareQ;
std::vector<logical_operand::oplog_t> logical_compareQ;
std::vector<base_statement*> exprQ;
std::vector<base_statement*> funcQ;
std::vector<base_statement*> whenThenQ;
std::vector<base_statement*> inPredicateQ;
base_statement* inMainArg;
std::vector<std::string> dataTypeQ;
std::vector<std::string> trimTypeQ;
std::vector<std::string> datePartQ;
projection_alias alias_map;
std::string from_clause;
std::vector<std::string> json_from_clause;
bool limit_op;
unsigned long limit;
std::string column_prefix;
std::string table_alias;
s3select_projections projections;
bool projection_or_predicate_state; //true->projection false->predicate(where-clause statement)
std::vector<base_statement*> predicate_columns;
std::vector<base_statement*> projections_columns;
base_statement* first_when_then_expr;
std::string json_array_name; // _1.a[ ] json_array_name = "a"; upon parser is scanning a correct json-path; json_array_name will contain the array name.
std::string json_object_name; // _1.b json_object_name = "b" ; upon parser is scanning a correct json-path; json_object_name will contain the object name.
std::deque<size_t> json_array_index_number; // _1.a.c[ some integer number >=0 ]; upon parser is scanning a correct json-path; json_array_index_number will contain the array index.
// or in the case of multidimensional contain seiries of index number
json_variable_access json_var_md;
std::vector<std::pair<json_variable_access*,size_t>> json_statement_variables_match_expression;//contains all statement variables and their search-expression for locating the correct values in input document
actionQ(): inMainArg(0),from_clause("##"),limit_op(false),column_prefix("##"),table_alias("##"),projection_or_predicate_state(true),first_when_then_expr(nullptr){}
std::map<const void*,std::vector<const char*> *> x_map;
~actionQ()
{
for(auto m : x_map)
delete m.second;
}
bool is_already_scanned(const void *th,const char *a)
{
//purpose: caller get indication in the case a specific builder is scan more than once the same text(pointer)
auto t = x_map.find(th);
if(t == x_map.end())
{
auto v = new std::vector<const char*>;
x_map.insert(std::pair<const void*,std::vector<const char*> *>(th,v));
v->push_back(a);
}
else
{
for(auto& c : *(t->second))
{
if( strcmp(c,a) == 0)
return true;
}
t->second->push_back(a);
}
return false;
}
};
class s3select;
struct base_ast_builder
{
void operator()(s3select* self, const char* a, const char* b) const;
virtual void builder(s3select* self, const char* a, const char* b) const = 0;
virtual ~base_ast_builder() = default;
};
struct push_from_clause : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_from_clause g_push_from_clause;
struct push_json_from_clause : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_json_from_clause g_push_json_from_clause;
struct push_limit_clause : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_limit_clause g_push_limit_clause;
struct push_number : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_number g_push_number;
struct push_float_number : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_float_number g_push_float_number;
struct push_string : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_string g_push_string;
struct push_variable : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_variable g_push_variable;
struct push_json_variable : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_json_variable g_push_json_variable;
/////////////////////////arithmetic unit /////////////////
struct push_addsub : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_addsub g_push_addsub;
struct push_mulop : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_mulop g_push_mulop;
struct push_addsub_binop : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_addsub_binop g_push_addsub_binop;
struct push_mulldiv_binop : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_mulldiv_binop g_push_mulldiv_binop;
struct push_function_arg : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_function_arg g_push_function_arg;
struct push_function_name : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_function_name g_push_function_name;
struct push_function_expr : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_function_expr g_push_function_expr;
struct push_cast_expr : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_cast_expr g_push_cast_expr;
struct push_cast_decimal_expr : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_cast_decimal_expr g_push_cast_decimal_expr;
struct push_decimal_operator : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_decimal_operator g_push_decimal_operator;
struct push_data_type : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_data_type g_push_data_type;
////////////////////// logical unit ////////////////////////
struct push_compare_operator : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_compare_operator g_push_compare_operator;
struct push_logical_operator : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_logical_operator g_push_logical_operator;
struct push_arithmetic_predicate : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_arithmetic_predicate g_push_arithmetic_predicate;
struct push_logical_predicate : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_logical_predicate g_push_logical_predicate;
struct push_negation : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_negation g_push_negation;
struct push_column_pos : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_column_pos g_push_column_pos;
struct push_projection : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_projection g_push_projection;
struct push_alias_projection : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_alias_projection g_push_alias_projection;
struct push_between_filter : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_between_filter g_push_between_filter;
struct push_not_between_filter : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_not_between_filter g_push_not_between_filter;
struct push_in_predicate : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_in_predicate g_push_in_predicate;
struct push_in_predicate_arguments : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_in_predicate_arguments g_push_in_predicate_arguments;
struct push_in_predicate_first_arg : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_in_predicate_first_arg g_push_in_predicate_first_arg;
struct push_like_predicate_escape : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_like_predicate_escape g_push_like_predicate_escape;
struct push_like_predicate_no_escape : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_like_predicate_no_escape g_push_like_predicate_no_escape;
struct push_is_null_predicate : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_is_null_predicate g_push_is_null_predicate;
struct push_case_when_else : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_case_when_else g_push_case_when_else;
struct push_when_condition_then : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_when_condition_then g_push_when_condition_then;
struct push_when_value_then : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_when_value_then g_push_when_value_then;
struct push_case_value_when_value_else : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_case_value_when_value_else g_push_case_value_when_value_else;
struct push_substr_from : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_substr_from g_push_substr_from;
struct push_substr_from_for : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_substr_from_for g_push_substr_from_for;
struct push_trim_type : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_trim_type g_push_trim_type;
struct push_trim_whitespace_both : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_trim_whitespace_both g_push_trim_whitespace_both;
struct push_trim_expr_one_side_whitespace : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_trim_expr_one_side_whitespace g_push_trim_expr_one_side_whitespace;
struct push_trim_expr_anychar_anyside : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_trim_expr_anychar_anyside g_push_trim_expr_anychar_anyside;
struct push_datediff : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_datediff g_push_datediff;
struct push_dateadd : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_dateadd g_push_dateadd;
struct push_extract : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_extract g_push_extract;
struct push_date_part : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_date_part g_push_date_part;
struct push_time_to_string_constant : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_time_to_string_constant g_push_time_to_string_constant;
struct push_time_to_string_dynamic : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_time_to_string_dynamic g_push_time_to_string_dynamic;
struct push_string_to_time_constant : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_string_to_time_constant g_push_string_to_time_constant;
struct push_array_number : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_array_number g_push_array_number;
struct push_json_array_name : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_json_array_name g_push_json_array_name;
struct push_json_object : public base_ast_builder
{
void builder(s3select* self, const char* a, const char* b) const;
};
static push_json_object g_push_json_object;
struct s3select : public bsc::grammar<s3select>
{
private:
actionQ m_actionQ;
scratch_area m_sca;
s3select_functions m_s3select_functions;
std::string error_description;
s3select_allocator m_s3select_allocator;
bool aggr_flow = false;
bool m_json_query = false;
std::set<base_statement*> m_ast_nodes_to_delete;
base_function* m_to_timestamp_for_clean = nullptr;
#define BOOST_BIND_ACTION( push_name ) boost::bind( &push_name::operator(), g_ ## push_name, const_cast<s3select*>(&self), _1, _2)
public:
std::set<base_statement*>& get_ast_nodes_to_delete()
{
return m_ast_nodes_to_delete;
}
base_function* & get_to_timestamp_for_clean()
{
return m_to_timestamp_for_clean;
}
actionQ* getAction()
{
return &m_actionQ;
}
s3select_allocator* getAllocator()
{
return &m_s3select_allocator;
}
s3select_functions* getS3F()
{
return &m_s3select_functions;
}
int semantic()
{
for (const auto &e : get_projections_list())
{
e->resolve_node();
//upon validate there is no aggregation-function nested calls, it validates legit aggregation call.
if (e->is_nested_aggregate(aggr_flow))
{
error_description = "nested aggregation function is illegal i.e. sum(...sum ...)";
throw base_s3select_exception(error_description, base_s3select_exception::s3select_exp_en_t::FATAL);
}
e->push_for_cleanup(m_ast_nodes_to_delete);
}
if(get_filter())
get_filter()->push_for_cleanup(m_ast_nodes_to_delete);
if (aggr_flow == true)
{// atleast one projection column contain aggregation function
for (const auto &e : get_projections_list())
{
auto aggregate_expr = e->get_aggregate();
if (aggregate_expr)
{
//per each column, subtree is mark to skip except for the aggregation function subtree.
//for an example: substring( ... , sum() , count() ) :: the substring is mark to skip execution, while sum and count not.
e->set_skip_non_aggregate(true);
e->mark_aggreagtion_subtree_to_execute();
}
else
{
//in case projection column is not aggregate, the projection column must *not* contain reference to columns.
if(e->is_column_reference())
{
error_description = "illegal query; projection contains aggregation function is not allowed with projection contains column reference";
throw base_s3select_exception(error_description, base_s3select_exception::s3select_exp_en_t::FATAL);
}
}
}
}
m_json_query = (m_actionQ.json_from_clause.size() != 0);
return 0;
}
int parse_query(const char* input_query)
{
if(get_projections_list().empty() == false)
{
return 0; //already parsed
}
error_description.clear();
aggr_flow = false;
try
{
bsc::parse_info<> info = bsc::parse(input_query, *this, bsc::space_p);
auto query_parse_position = info.stop;
if (!info.full)
{
error_description = std::string("failure -->") + query_parse_position + std::string("<---");
return -1;
}
semantic();
}
catch (base_s3select_exception& e)
{
error_description.assign(e.what());
if (e.severity() == base_s3select_exception::s3select_exp_en_t::FATAL) //abort query execution
{
return -1;
}
}
return 0;
}
std::string get_error_description()
{
return error_description;
}
s3select()
{
m_s3select_functions.setAllocator(&m_s3select_allocator);
m_s3select_functions.set_AST_nodes_for_cleanup(&m_ast_nodes_to_delete);
}
bool is_semantic()//TBD traverse and validate semantics per all nodes
{
base_statement* cond = m_actionQ.exprQ.back();
return cond->semantic();
}
std::string get_from_clause() const
{
return m_actionQ.from_clause;
}
bool is_limit()
{
return m_actionQ.limit_op;
}
unsigned long get_limit()
{
return m_actionQ.limit;
}
void load_schema(std::vector< std::string>& scm)
{
int i = 0;
for (auto& c : scm)
{
m_sca.set_column_pos(c.c_str(), i++);
}
}
base_statement* get_filter()
{
if(m_actionQ.exprQ.empty())
{
return nullptr;
}
return m_actionQ.exprQ.back();
}
std::vector<base_statement*> get_projections_list()
{
return *m_actionQ.projections.get(); //TODO return COPY(?) or to return evalaution results (list of class value{}) / return reference(?)
}
scratch_area* get_scratch_area()
{
return &m_sca;
}
projection_alias* get_aliases()
{
return &m_actionQ.alias_map;
}
std::vector<std::pair<json_variable_access*,size_t>>& get_json_variables_access()
{
return m_actionQ.json_statement_variables_match_expression;
}
bool is_aggregate_query() const
{
return aggr_flow == true;
}
bool is_json_query()
{
return m_json_query;
}
~s3select()
{
for(auto it : m_ast_nodes_to_delete)
{
if (it->is_function())
{//upon its a function, call to the implementation destructor
if(dynamic_cast<__function*>(it)->impl())
dynamic_cast<__function*>(it)->impl()->dtor();
}
//calling to destrcutor of class-function itself, or non-function destructor
it->dtor();
}
for(auto x: m_actionQ.json_statement_variables_match_expression)
{//the json_variable_access object is allocated by S3SELECT_NEW. this object contains stl-vector that should be free
x.first->~json_variable_access();
}
if(m_to_timestamp_for_clean)
{
m_to_timestamp_for_clean->dtor();
}
}
#define JSON_ROOT_OBJECT "s3object[*]"
//the input is converted to lower case
#define S3SELECT_KW( reserve_word ) bsc::as_lower_d[ reserve_word ]
template <typename ScannerT>
struct definition
{
explicit definition(s3select const& self)
{
///// s3select syntax rules and actions for building AST
select_expr = select_expr_base_ >> bsc::lexeme_d[ *(bsc::str_p(" ")|bsc::str_p(";")) ];
select_expr_base_ = select_expr_base >> S3SELECT_KW("limit") >> (limit_number)[BOOST_BIND_ACTION(push_limit_clause)] | select_expr_base;
limit_number = (+bsc::digit_p);
select_expr_base = S3SELECT_KW("select") >> projections >> S3SELECT_KW("from") >> (from_expression)[BOOST_BIND_ACTION(push_from_clause)] >> !where_clause ;
projections = projection_expression >> *( ',' >> projection_expression) ;
projection_expression = (arithmetic_expression >> S3SELECT_KW("as") >> alias_name)[BOOST_BIND_ACTION(push_alias_projection)] |
(arithmetic_expression)[BOOST_BIND_ACTION(push_projection)] |
(arithmetic_predicate >> S3SELECT_KW("as") >> alias_name)[BOOST_BIND_ACTION(push_alias_projection)] |
(arithmetic_predicate)[BOOST_BIND_ACTION(push_projection)] ;
alias_name = bsc::lexeme_d[(+bsc::alpha_p >> *bsc::digit_p)] ;
when_case_else_projection = (S3SELECT_KW("case") >> (+when_stmt) >> S3SELECT_KW("else") >> arithmetic_expression >> S3SELECT_KW("end")) [BOOST_BIND_ACTION(push_case_when_else)];
when_stmt = (S3SELECT_KW("when") >> condition_expression >> S3SELECT_KW("then") >> arithmetic_expression)[BOOST_BIND_ACTION(push_when_condition_then)];
when_case_value_when = (S3SELECT_KW("case") >> arithmetic_expression >>
(+when_value_then) >> S3SELECT_KW("else") >> arithmetic_expression >> S3SELECT_KW("end")) [BOOST_BIND_ACTION(push_case_value_when_value_else)];
when_value_then = (S3SELECT_KW("when") >> arithmetic_expression >> S3SELECT_KW("then") >> arithmetic_expression)[BOOST_BIND_ACTION(push_when_value_then)];
from_expression = (s3_object >> variable_name ) | s3_object;
//the stdin and object_path are for debug purposes(not part of the specs)
s3_object = json_s3_object | S3SELECT_KW("stdin") | S3SELECT_KW("s3object") | object_path;
json_s3_object = ((S3SELECT_KW(JSON_ROOT_OBJECT)) >> *(bsc::str_p(".") >> json_path_element))[BOOST_BIND_ACTION(push_json_from_clause)];
json_path_element = bsc::lexeme_d[+( bsc::alnum_p | bsc::str_p("_")) ];
object_path = "/" >> *( fs_type >> "/") >> fs_type;
fs_type = bsc::lexeme_d[+( bsc::alnum_p | bsc::str_p(".") | bsc::str_p("_")) ];
where_clause = S3SELECT_KW("where") >> condition_expression;
condition_expression = arithmetic_predicate;
arithmetic_predicate = (S3SELECT_KW("not") >> logical_predicate)[BOOST_BIND_ACTION(push_negation)] | logical_predicate;
logical_predicate = (logical_and) >> *(or_op[BOOST_BIND_ACTION(push_logical_operator)] >> (logical_and)[BOOST_BIND_ACTION(push_logical_predicate)]);
logical_and = (cmp_operand) >> *(and_op[BOOST_BIND_ACTION(push_logical_operator)] >> (cmp_operand)[BOOST_BIND_ACTION(push_logical_predicate)]);
cmp_operand = special_predicates | (factor) >> *(arith_cmp[BOOST_BIND_ACTION(push_compare_operator)] >> (factor)[BOOST_BIND_ACTION(push_arithmetic_predicate)]);
special_predicates = (is_null) | (is_not_null) | (between_predicate) | (not_between) | (in_predicate) | (like_predicate);
is_null = ((factor) >> S3SELECT_KW("is") >> S3SELECT_KW("null"))[BOOST_BIND_ACTION(push_is_null_predicate)];
is_not_null = ((factor) >> S3SELECT_KW("is") >> S3SELECT_KW("not") >> S3SELECT_KW("null"))[BOOST_BIND_ACTION(push_is_null_predicate)];
between_predicate = (arithmetic_expression >> S3SELECT_KW("between") >> arithmetic_expression >> S3SELECT_KW("and") >> arithmetic_expression)[BOOST_BIND_ACTION(push_between_filter)];
not_between = (arithmetic_expression >> S3SELECT_KW("not") >> S3SELECT_KW("between") >> arithmetic_expression >> S3SELECT_KW("and") >> arithmetic_expression)[BOOST_BIND_ACTION(push_not_between_filter)];
in_predicate = (arithmetic_expression >> S3SELECT_KW("in") >> '(' >> arithmetic_expression[BOOST_BIND_ACTION(push_in_predicate_first_arg)] >> *(',' >> arithmetic_expression[BOOST_BIND_ACTION(push_in_predicate_arguments)]) >> ')')[BOOST_BIND_ACTION(push_in_predicate)];
like_predicate = (like_predicate_escape) |(like_predicate_no_escape);
like_predicate_no_escape = (arithmetic_expression >> S3SELECT_KW("like") >> arithmetic_expression)[BOOST_BIND_ACTION(push_like_predicate_no_escape)];
like_predicate_escape = (arithmetic_expression >> S3SELECT_KW("like") >> arithmetic_expression >> S3SELECT_KW("escape") >> arithmetic_expression)[BOOST_BIND_ACTION(push_like_predicate_escape)];
factor = arithmetic_expression | ( '(' >> arithmetic_predicate >> ')' ) ;
arithmetic_expression = (addsub_operand >> *(addsubop_operator[BOOST_BIND_ACTION(push_addsub)] >> addsub_operand[BOOST_BIND_ACTION(push_addsub_binop)] ));
addsub_operand = (mulldiv_operand >> *(muldiv_operator[BOOST_BIND_ACTION(push_mulop)] >> mulldiv_operand[BOOST_BIND_ACTION(push_mulldiv_binop)] ));// this non-terminal gives precedense to mull/div
mulldiv_operand = arithmetic_argument | ('(' >> (arithmetic_expression) >> ')') ;
list_of_function_arguments = (arithmetic_expression)[BOOST_BIND_ACTION(push_function_arg)] >> *(',' >> (arithmetic_expression)[BOOST_BIND_ACTION(push_function_arg)]);
reserved_function_names = (S3SELECT_KW("when")|S3SELECT_KW("case")|S3SELECT_KW("then")|S3SELECT_KW("not")|S3SELECT_KW("limit")|S3SELECT_KW("where")|S3SELECT_KW("in")|S3SELECT_KW("between") |
S3SELECT_KW("like")|S3SELECT_KW("is") );
function = ( ((variable_name) >> '(' )[BOOST_BIND_ACTION(push_function_name)] >> !list_of_function_arguments >> ')')[BOOST_BIND_ACTION(push_function_expr)];
arithmetic_argument = (float_number)[BOOST_BIND_ACTION(push_float_number)] | (number)[BOOST_BIND_ACTION(push_number)] | (json_variable_name)[BOOST_BIND_ACTION(push_json_variable)] |
(column_pos)[BOOST_BIND_ACTION(push_column_pos)] |
(string)[BOOST_BIND_ACTION(push_string)] | (backtick_string) | (datediff) | (dateadd) | (extract) | (time_to_string_constant) | (time_to_string_dynamic) |
(cast) | (substr) | (trim) | (when_case_value_when) | (when_case_else_projection) |
(function) | (variable)[BOOST_BIND_ACTION(push_variable)]; //function is pushed by right-term
cast = cast_as_data_type | cast_as_decimal_expr ;
cast_as_data_type = (S3SELECT_KW("cast") >> '(' >> factor >> S3SELECT_KW("as") >> (data_type) >> ')') [BOOST_BIND_ACTION(push_cast_expr)];
cast_as_decimal_expr = (S3SELECT_KW("cast") >> '(' >> factor >> S3SELECT_KW("as") >> decimal_operator >> ')') [BOOST_BIND_ACTION(push_cast_decimal_expr)];
decimal_operator = (S3SELECT_KW("decimal") >> '(' >> (number)[BOOST_BIND_ACTION(push_number)] >> ',' >> (number)[BOOST_BIND_ACTION(push_number)] >> ')')
[BOOST_BIND_ACTION(push_decimal_operator)];
data_type = (S3SELECT_KW("int") | S3SELECT_KW("float") | S3SELECT_KW("string") | S3SELECT_KW("timestamp") | S3SELECT_KW("bool"))[BOOST_BIND_ACTION(push_data_type)];
substr = (substr_from) | (substr_from_for);
substr_from = (S3SELECT_KW("substring") >> '(' >> (arithmetic_expression >> S3SELECT_KW("from") >> arithmetic_expression) >> ')') [BOOST_BIND_ACTION(push_substr_from)];
substr_from_for = (S3SELECT_KW("substring") >> '(' >> (arithmetic_expression >> S3SELECT_KW("from") >> arithmetic_expression >> S3SELECT_KW("for") >> arithmetic_expression) >> ')') [BOOST_BIND_ACTION(push_substr_from_for)];
trim = (trim_whitespace_both) | (trim_one_side_whitespace) | (trim_anychar_anyside);
trim_one_side_whitespace = (S3SELECT_KW("trim") >> '(' >> (trim_type)[BOOST_BIND_ACTION(push_trim_type)] >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_trim_expr_one_side_whitespace)];
trim_whitespace_both = (S3SELECT_KW("trim") >> '(' >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_trim_whitespace_both)];
trim_anychar_anyside = (S3SELECT_KW("trim") >> '(' >> ((trim_remove_type)[BOOST_BIND_ACTION(push_trim_type)] >> arithmetic_expression >> S3SELECT_KW("from") >> arithmetic_expression) >> ')') [BOOST_BIND_ACTION(push_trim_expr_anychar_anyside)];
trim_type = ((S3SELECT_KW("leading") >> S3SELECT_KW("from")) | ( S3SELECT_KW("trailing") >> S3SELECT_KW("from")) | (S3SELECT_KW("both") >> S3SELECT_KW("from")) | S3SELECT_KW("from") );
trim_remove_type = (S3SELECT_KW("leading") | S3SELECT_KW("trailing") | S3SELECT_KW("both") );
datediff = (S3SELECT_KW("date_diff") >> '(' >> date_part >> ',' >> arithmetic_expression >> ',' >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_datediff)];
dateadd = (S3SELECT_KW("date_add") >> '(' >> date_part >> ',' >> arithmetic_expression >> ',' >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_dateadd)];
extract = (S3SELECT_KW("extract") >> '(' >> (date_part_extract)[BOOST_BIND_ACTION(push_date_part)] >> S3SELECT_KW("from") >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_extract)];
date_part = (S3SELECT_KW("year") | S3SELECT_KW("month") | S3SELECT_KW("day") | S3SELECT_KW("hour") | S3SELECT_KW("minute") | S3SELECT_KW("second")) [BOOST_BIND_ACTION(push_date_part)];
date_part_extract = ((date_part) | S3SELECT_KW("week") | S3SELECT_KW("timezone_hour") | S3SELECT_KW("timezone_minute"));
time_to_string_constant = (S3SELECT_KW("to_string") >> '(' >> arithmetic_expression >> ',' >> (string)[BOOST_BIND_ACTION(push_string)] >> ')') [BOOST_BIND_ACTION(push_time_to_string_constant)];
time_to_string_dynamic = (S3SELECT_KW("to_string") >> '(' >> arithmetic_expression >> ',' >> arithmetic_expression >> ')') [BOOST_BIND_ACTION(push_time_to_string_dynamic)];
number = bsc::int_p;
float_number = bsc::real_p;
string = (bsc::str_p("\"") >> *( bsc::anychar_p - bsc::str_p("\"") ) >> bsc::str_p("\"")) | (bsc::str_p("\'") >> *( bsc::anychar_p - bsc::str_p("\'") ) >> bsc::str_p("\'"));
backtick_string = (bsc::str_p("`") >> *( bsc::anychar_p - bsc::str_p("`") ) >> bsc::str_p("`")) [BOOST_BIND_ACTION(push_string_to_time_constant)];
column_pos = (variable_name >> "." >> column_pos_name) | column_pos_name; //TODO what about space
column_pos_name = ('_'>>+(bsc::digit_p) ) | '*' ;
muldiv_operator = bsc::str_p("*") | bsc::str_p("/") | bsc::str_p("^") | bsc::str_p("%");// got precedense
addsubop_operator = bsc::str_p("+") | bsc::str_p("-");
arith_cmp = bsc::str_p("<>") | bsc::str_p(">=") | bsc::str_p("<=") | bsc::str_p("=") | bsc::str_p("<") | bsc::str_p(">") | bsc::str_p("!=");
and_op = S3SELECT_KW("and");
or_op = S3SELECT_KW("or");
variable_name = bsc::lexeme_d[(+bsc::alpha_p >> *( bsc::alpha_p | bsc::digit_p | '_') ) - reserved_function_names];
variable = (variable_name >> "." >> variable_name) | variable_name;
json_variable_name = bsc::str_p("_1") >> +("." >> (json_array | json_object) );
json_object = (variable_name)[BOOST_BIND_ACTION(push_json_object)];
json_array = (variable_name >> +(bsc::str_p("[") >> number[BOOST_BIND_ACTION(push_array_number)] >> bsc::str_p("]")) )[BOOST_BIND_ACTION(push_json_array_name)];
}
bsc::rule<ScannerT> cast, data_type, variable, json_variable_name, variable_name, select_expr, select_expr_base, select_expr_base_, s3_object, where_clause, limit_number;
bsc::rule<ScannerT> number, float_number, string, backtick_string, from_expression, cast_as_data_type, cast_as_decimal_expr, decimal_operator;
bsc::rule<ScannerT> cmp_operand, arith_cmp, condition_expression, arithmetic_predicate, logical_predicate, factor;
bsc::rule<ScannerT> trim, trim_whitespace_both, trim_one_side_whitespace, trim_anychar_anyside, trim_type, trim_remove_type, substr, substr_from, substr_from_for;
bsc::rule<ScannerT> datediff, dateadd, extract, date_part, date_part_extract, time_to_string_constant, time_to_string_dynamic;
bsc::rule<ScannerT> special_predicates, between_predicate, not_between, in_predicate, like_predicate, like_predicate_escape, like_predicate_no_escape, is_null, is_not_null;
bsc::rule<ScannerT> muldiv_operator, addsubop_operator, function, arithmetic_expression, addsub_operand, list_of_function_arguments, arithmetic_argument, mulldiv_operand, reserved_function_names;
bsc::rule<ScannerT> fs_type, object_path,json_s3_object,json_path_element,json_object,json_array;
bsc::rule<ScannerT> projections, projection_expression, alias_name, column_pos,column_pos_name;
bsc::rule<ScannerT> when_case_else_projection, when_case_value_when, when_stmt, when_value_then;
bsc::rule<ScannerT> logical_and,and_op,or_op;
bsc::rule<ScannerT> const& start() const
{
return select_expr ;
}
};
};
void base_ast_builder::operator()(s3select *self, const char *a, const char *b) const
{
//the purpose of the following procedure is to bypass boost::spirit rescan (calling to bind-action more than once per the same text)
//which cause wrong AST creation (and later false execution).
if (self->getAction()->is_already_scanned((void *)(this), const_cast<char *>(a)))
return;
builder(self, a, b);
}
void push_from_clause::builder(s3select* self, const char* a, const char* b) const
{
std::string token(a, b),table_name,alias_name;
//should search for generic space
if(token.find(' ') != std::string::npos)
{
size_t pos = token.find(' ');
table_name = token.substr(0,pos);
pos = token.rfind(' ');
alias_name = token.substr(pos+1,token.size());
self->getAction()->table_alias = alias_name;
if(self->getAction()->column_prefix != "##" && self->getAction()->table_alias != self->getAction()->column_prefix)
{
throw base_s3select_exception(std::string("query can not contain more then a single table-alias"), base_s3select_exception::s3select_exp_en_t::FATAL);
}
token = table_name;
}
self->getAction()->from_clause = token;
self->getAction()->exprQ.clear();
}
void push_json_from_clause::builder(s3select* self, const char* a, const char* b) const
{
std::string token(a, b),table_name,alias_name;
//TODO handle the star-operation ('*') in from-clause. build the parameters for json-reader search-api's.
std::vector<std::string> variable_key_path;
const char* delimiter = ".";
auto pos = token.find(delimiter);
if(pos != std::string::npos)
{
token = token.substr(strlen(JSON_ROOT_OBJECT)+1,token.size());
pos = token.find(delimiter);
do
{
variable_key_path.push_back(token.substr(0,pos));
if(pos != std::string::npos)
token = token.substr(pos+1,token.size());
else
token = "";
pos = token.find(delimiter);
}while(token.size());
}
else
{
variable_key_path.push_back(JSON_ROOT_OBJECT);
}
self->getAction()->json_from_clause = variable_key_path;
}
void push_limit_clause::builder(s3select* self, const char* a, const char* b) const
{
std::string token(a, b);
self->getAction()->limit_op = true;
try
{
self->getAction()->limit = std::stoul(token);
}
catch(std::invalid_argument& e)
{
throw base_s3select_exception(std::string("Invalid argument "), base_s3select_exception::s3select_exp_en_t::FATAL);
}
catch(std::out_of_range& e)
{
throw base_s3select_exception(std::string("Out of range "), base_s3select_exception::s3select_exp_en_t::FATAL);
}
}
void push_number::builder(s3select* self, const char* a, const char* b) const
{
std::string token(a, b);
variable* v = S3SELECT_NEW(self, variable, atoi(token.c_str()));
self->getAction()->exprQ.push_back(v);
}
void push_float_number::builder(s3select* self, const char* a, const char* b) const
{
std::string token(a, b);