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ScalarExprVisitor.h
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1 /*
2  * Copyright 2017 MapD Technologies, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef QUERYENGINE_SCALAREXPRVISITOR_H
18 #define QUERYENGINE_SCALAREXPRVISITOR_H
19 
20 #include "../Analyzer/Analyzer.h"
21 
22 template <class T>
24  public:
25  T visit(const Analyzer::Expr* expr) const {
26  CHECK(expr);
27  const auto var = dynamic_cast<const Analyzer::Var*>(expr);
28  if (var) {
29  return visitVar(var);
30  }
31  const auto column_var = dynamic_cast<const Analyzer::ColumnVar*>(expr);
32  if (column_var) {
33  return visitColumnVar(column_var);
34  }
35  const auto column_var_tuple = dynamic_cast<const Analyzer::ExpressionTuple*>(expr);
36  if (column_var_tuple) {
37  return visitColumnVarTuple(column_var_tuple);
38  }
39  const auto constant = dynamic_cast<const Analyzer::Constant*>(expr);
40  if (constant) {
41  return visitConstant(constant);
42  }
43  const auto uoper = dynamic_cast<const Analyzer::UOper*>(expr);
44  if (uoper) {
45  return visitUOper(uoper);
46  }
47  const auto bin_oper = dynamic_cast<const Analyzer::BinOper*>(expr);
48  if (bin_oper) {
49  return visitBinOper(bin_oper);
50  }
51  const auto in_values = dynamic_cast<const Analyzer::InValues*>(expr);
52  if (in_values) {
53  return visitInValues(in_values);
54  }
55  const auto in_integer_set = dynamic_cast<const Analyzer::InIntegerSet*>(expr);
56  if (in_integer_set) {
57  return visitInIntegerSet(in_integer_set);
58  }
59  const auto char_length = dynamic_cast<const Analyzer::CharLengthExpr*>(expr);
60  if (char_length) {
62  }
63  const auto key_for_string = dynamic_cast<const Analyzer::KeyForStringExpr*>(expr);
64  if (key_for_string) {
65  return visitKeyForString(key_for_string);
66  }
67  const auto lower = dynamic_cast<const Analyzer::LowerExpr*>(expr);
68  if (lower) {
69  return visitLower(lower);
70  }
71  const auto cardinality = dynamic_cast<const Analyzer::CardinalityExpr*>(expr);
72  if (cardinality) {
73  return visitCardinality(cardinality);
74  }
75  const auto like_expr = dynamic_cast<const Analyzer::LikeExpr*>(expr);
76  if (like_expr) {
77  return visitLikeExpr(like_expr);
78  }
79  const auto regexp_expr = dynamic_cast<const Analyzer::RegexpExpr*>(expr);
80  if (regexp_expr) {
81  return visitRegexpExpr(regexp_expr);
82  }
83  const auto case_ = dynamic_cast<const Analyzer::CaseExpr*>(expr);
84  if (case_) {
85  return visitCaseExpr(case_);
86  }
87  const auto datetrunc = dynamic_cast<const Analyzer::DatetruncExpr*>(expr);
88  if (datetrunc) {
89  return visitDatetruncExpr(datetrunc);
90  }
91  const auto extract = dynamic_cast<const Analyzer::ExtractExpr*>(expr);
92  if (extract) {
93  return visitExtractExpr(extract);
94  }
95  const auto window_func = dynamic_cast<const Analyzer::WindowFunction*>(expr);
96  if (window_func) {
97  return visitWindowFunction(window_func);
98  }
99  const auto func_with_custom_type_handling =
100  dynamic_cast<const Analyzer::FunctionOperWithCustomTypeHandling*>(expr);
101  if (func_with_custom_type_handling) {
102  return visitFunctionOperWithCustomTypeHandling(func_with_custom_type_handling);
103  }
104  const auto func = dynamic_cast<const Analyzer::FunctionOper*>(expr);
105  if (func) {
106  return visitFunctionOper(func);
107  }
108  const auto array = dynamic_cast<const Analyzer::ArrayExpr*>(expr);
109  if (array) {
110  return visitArrayOper(array);
111  }
112  const auto geo_expr = dynamic_cast<const Analyzer::GeoExpr*>(expr);
113  if (geo_expr) {
114  return visitGeoExpr(geo_expr);
115  }
116  const auto datediff = dynamic_cast<const Analyzer::DatediffExpr*>(expr);
117  if (datediff) {
118  return visitDatediffExpr(datediff);
119  }
120  const auto dateadd = dynamic_cast<const Analyzer::DateaddExpr*>(expr);
121  if (dateadd) {
122  return visitDateaddExpr(dateadd);
123  }
124  const auto likelihood = dynamic_cast<const Analyzer::LikelihoodExpr*>(expr);
125  if (likelihood) {
126  return visitLikelihood(likelihood);
127  }
128  const auto offset_in_fragment = dynamic_cast<const Analyzer::OffsetInFragment*>(expr);
129  if (offset_in_fragment) {
130  return visitOffsetInFragment(offset_in_fragment);
131  }
132  const auto agg = dynamic_cast<const Analyzer::AggExpr*>(expr);
133  if (agg) {
134  return visitAggExpr(agg);
135  }
136  return defaultResult();
137  }
138 
139  protected:
140  virtual T visitVar(const Analyzer::Var*) const { return defaultResult(); }
141 
142  virtual T visitColumnVar(const Analyzer::ColumnVar*) const { return defaultResult(); }
143 
145  return defaultResult();
146  }
147 
148  virtual T visitConstant(const Analyzer::Constant*) const { return defaultResult(); }
149 
150  virtual T visitUOper(const Analyzer::UOper* uoper) const {
151  T result = defaultResult();
152  result = aggregateResult(result, visit(uoper->get_operand()));
153  return result;
154  }
155 
156  virtual T visitBinOper(const Analyzer::BinOper* bin_oper) const {
157  T result = defaultResult();
158  result = aggregateResult(result, visit(bin_oper->get_left_operand()));
159  result = aggregateResult(result, visit(bin_oper->get_right_operand()));
160  return result;
161  }
162 
163  virtual T visitInValues(const Analyzer::InValues* in_values) const {
164  T result = visit(in_values->get_arg());
165  const auto& value_list = in_values->get_value_list();
166  for (const auto in_value : value_list) {
167  result = aggregateResult(result, visit(in_value.get()));
168  }
169  return result;
170  }
171 
172  virtual T visitInIntegerSet(const Analyzer::InIntegerSet* in_integer_set) const {
173  return visit(in_integer_set->get_arg());
174  }
175 
177  T result = defaultResult();
178  result = aggregateResult(result, visit(char_length->get_arg()));
179  return result;
180  }
181 
182  virtual T visitKeyForString(const Analyzer::KeyForStringExpr* key_for_string) const {
183  T result = defaultResult();
184  result = aggregateResult(result, visit(key_for_string->get_arg()));
185  return result;
186  }
187 
188  virtual T visitLower(const Analyzer::LowerExpr* lower_expr) const {
189  return visit(lower_expr->get_arg());
190  }
191 
192  virtual T visitCardinality(const Analyzer::CardinalityExpr* cardinality) const {
193  T result = defaultResult();
194  result = aggregateResult(result, visit(cardinality->get_arg()));
195  return result;
196  }
197 
198  virtual T visitLikeExpr(const Analyzer::LikeExpr* like) const {
199  T result = defaultResult();
200  result = aggregateResult(result, visit(like->get_arg()));
201  result = aggregateResult(result, visit(like->get_like_expr()));
202  if (like->get_escape_expr()) {
203  result = aggregateResult(result, visit(like->get_escape_expr()));
204  }
205  return result;
206  }
207 
208  virtual T visitRegexpExpr(const Analyzer::RegexpExpr* regexp) const {
209  T result = defaultResult();
210  result = aggregateResult(result, visit(regexp->get_arg()));
211  result = aggregateResult(result, visit(regexp->get_pattern_expr()));
212  if (regexp->get_escape_expr()) {
213  result = aggregateResult(result, visit(regexp->get_escape_expr()));
214  }
215  return result;
216  }
217 
218  virtual T visitCaseExpr(const Analyzer::CaseExpr* case_) const {
219  T result = defaultResult();
220  const auto& expr_pair_list = case_->get_expr_pair_list();
221  for (const auto& expr_pair : expr_pair_list) {
222  result = aggregateResult(result, visit(expr_pair.first.get()));
223  result = aggregateResult(result, visit(expr_pair.second.get()));
224  }
225  result = aggregateResult(result, visit(case_->get_else_expr()));
226  return result;
227  }
228 
229  virtual T visitDatetruncExpr(const Analyzer::DatetruncExpr* datetrunc) const {
230  T result = defaultResult();
231  result = aggregateResult(result, visit(datetrunc->get_from_expr()));
232  return result;
233  }
234 
235  virtual T visitExtractExpr(const Analyzer::ExtractExpr* extract) const {
236  T result = defaultResult();
237  result = aggregateResult(result, visit(extract->get_from_expr()));
238  return result;
239  }
240 
242  const Analyzer::FunctionOperWithCustomTypeHandling* func_oper) const {
243  return visitFunctionOper(func_oper);
244  }
245 
246  virtual T visitArrayOper(Analyzer::ArrayExpr const* array_expr) const {
247  T result = defaultResult();
248  for (size_t i = 0; i < array_expr->getElementCount(); ++i) {
249  result = aggregateResult(result, visit(array_expr->getElement(i)));
250  }
251  return result;
252  }
253 
254  virtual T visitGeoExpr(const Analyzer::GeoExpr* geo_expr) const {
255  T result = defaultResult();
256  for (const auto& arg : geo_expr->getArgs()) {
257  result = aggregateResult(result, visit(arg.get()));
258  }
259  return result;
260  }
261 
262  virtual T visitFunctionOper(const Analyzer::FunctionOper* func_oper) const {
263  T result = defaultResult();
264  for (size_t i = 0; i < func_oper->getArity(); ++i) {
265  result = aggregateResult(result, visit(func_oper->getArg(i)));
266  }
267  return result;
268  }
269 
270  virtual T visitWindowFunction(const Analyzer::WindowFunction* window_func) const {
271  T result = defaultResult();
272  for (const auto& arg : window_func->getArgs()) {
273  result = aggregateResult(result, visit(arg.get()));
274  }
275  for (const auto& partition_key : window_func->getPartitionKeys()) {
276  result = aggregateResult(result, visit(partition_key.get()));
277  }
278  for (const auto& order_key : window_func->getOrderKeys()) {
279  result = aggregateResult(result, visit(order_key.get()));
280  }
281  return result;
282  }
283 
284  virtual T visitDatediffExpr(const Analyzer::DatediffExpr* datediff) const {
285  T result = defaultResult();
286  result = aggregateResult(result, visit(datediff->get_start_expr()));
287  result = aggregateResult(result, visit(datediff->get_end_expr()));
288  return result;
289  }
290 
291  virtual T visitDateaddExpr(const Analyzer::DateaddExpr* dateadd) const {
292  T result = defaultResult();
293  result = aggregateResult(result, visit(dateadd->get_number_expr()));
294  result = aggregateResult(result, visit(dateadd->get_datetime_expr()));
295  return result;
296  }
297 
298  virtual T visitLikelihood(const Analyzer::LikelihoodExpr* likelihood) const {
299  return visit(likelihood->get_arg());
300  }
301 
303  return defaultResult();
304  }
305 
306  virtual T visitAggExpr(const Analyzer::AggExpr* agg) const {
307  T result = defaultResult();
308  return aggregateResult(result, visit(agg->get_arg()));
309  }
310 
311  protected:
312  virtual T aggregateResult(const T& aggregate, const T& next_result) const {
313  return next_result;
314  }
315 
316  virtual T defaultResult() const { return T{}; }
317 };
318 
319 #endif // QUERYENGINE_SCALAREXPRVISITOR_H
virtual T visitAggExpr(const Analyzer::AggExpr *agg) const
const Expr * get_from_expr() const
Definition: Analyzer.h:1146
virtual T aggregateResult(const T &aggregate, const T &next_result) const
virtual T visitOffsetInFragment(const Analyzer::OffsetInFragment *) const
const Expr * get_else_expr() const
Definition: Analyzer.h:1101
const Expr * get_escape_expr() const
Definition: Analyzer.h:857
size_t getArity() const
Definition: Analyzer.h:1309
const std::vector< std::shared_ptr< Analyzer::Expr > > & getArgs() const
Definition: Analyzer.h:1473
const Expr * get_escape_expr() const
Definition: Analyzer.h:929
const Expr * get_right_operand() const
Definition: Analyzer.h:437
const Expr * get_arg() const
Definition: Analyzer.h:926
Expr * get_arg() const
Definition: Analyzer.h:1045
const Expr * get_arg() const
Definition: Analyzer.h:982
T visit(const Analyzer::Expr *expr) const
virtual T visitCardinality(const Analyzer::CardinalityExpr *cardinality) const
const std::vector< std::shared_ptr< Analyzer::Expr > > & getOrderKeys() const
Definition: Analyzer.h:1404
virtual T visitExtractExpr(const Analyzer::ExtractExpr *extract) const
const Expr * get_arg() const
Definition: Analyzer.h:854
virtual T visitLikelihood(const Analyzer::LikelihoodExpr *likelihood) const
virtual T visitCharLength(const Analyzer::CharLengthExpr *char_length) const
virtual T visitVar(const Analyzer::Var *) const
virtual T visitGeoExpr(const Analyzer::GeoExpr *geo_expr) const
virtual T visitLikeExpr(const Analyzer::LikeExpr *like) const
CHECK(cgen_state)
ALWAYS_INLINE DEVICE int32_t char_length(const char *str, const int32_t str_len)
const std::vector< std::shared_ptr< Analyzer::Expr > > & getArgs() const
Definition: Analyzer.h:1398
virtual T visitLower(const Analyzer::LowerExpr *lower_expr) const
virtual T visitColumnVar(const Analyzer::ColumnVar *) const
virtual T visitWindowFunction(const Analyzer::WindowFunction *window_func) const
const Expr * get_start_expr() const
Definition: Analyzer.h:1229
size_t getElementCount() const
Definition: Analyzer.h:1437
virtual T visitDatediffExpr(const Analyzer::DatediffExpr *datediff) const
const Expr * get_pattern_expr() const
Definition: Analyzer.h:928
virtual T visitDateaddExpr(const Analyzer::DateaddExpr *dateadd) const
const Expr * get_from_expr() const
Definition: Analyzer.h:1271
const Expr * get_datetime_expr() const
Definition: Analyzer.h:1188
const Expr * get_like_expr() const
Definition: Analyzer.h:856
const Analyzer::Expr * getArg(const size_t i) const
Definition: Analyzer.h:1311
const Expr * get_operand() const
Definition: Analyzer.h:365
const Expr * get_arg() const
Definition: Analyzer.h:650
const std::list< std::shared_ptr< Analyzer::Expr > > & get_value_list() const
Definition: Analyzer.h:580
virtual T visitConstant(const Analyzer::Constant *) const
virtual T visitKeyForString(const Analyzer::KeyForStringExpr *key_for_string) const
Expression class for the LOWER (lowercase) string function. The &quot;arg&quot; constructor parameter must be a...
Definition: Analyzer.h:740
virtual T visitCaseExpr(const Analyzer::CaseExpr *case_) const
virtual T visitBinOper(const Analyzer::BinOper *bin_oper) const
const Expr * get_arg() const
Definition: Analyzer.h:699
virtual T visitInValues(const Analyzer::InValues *in_values) const
virtual T visitInIntegerSet(const Analyzer::InIntegerSet *in_integer_set) const
const Expr * get_end_expr() const
Definition: Analyzer.h:1230
virtual T visitFunctionOperWithCustomTypeHandling(const Analyzer::FunctionOperWithCustomTypeHandling *func_oper) const
virtual T visitFunctionOper(const Analyzer::FunctionOper *func_oper) const
virtual T visitArrayOper(Analyzer::ArrayExpr const *array_expr) const
virtual T defaultResult() const
const Expr * get_left_operand() const
Definition: Analyzer.h:436
virtual T visitRegexpExpr(const Analyzer::RegexpExpr *regexp) const
virtual T visitUOper(const Analyzer::UOper *uoper) const
virtual T visitColumnVarTuple(const Analyzer::ExpressionTuple *) const
const Expr * get_arg() const
Definition: Analyzer.h:627
virtual T visitDatetruncExpr(const Analyzer::DatetruncExpr *datetrunc) const
const std::vector< std::shared_ptr< Analyzer::Expr > > & getPartitionKeys() const
Definition: Analyzer.h:1400
const Expr * get_arg() const
Definition: Analyzer.h:800
const Expr * get_arg() const
Definition: Analyzer.h:578
const std::list< std::pair< std::shared_ptr< Analyzer::Expr >, std::shared_ptr< Analyzer::Expr > > > & get_expr_pair_list() const
Definition: Analyzer.h:1098
const Expr * get_arg() const
Definition: Analyzer.h:744
const Expr * get_number_expr() const
Definition: Analyzer.h:1187
const Analyzer::Expr * getElement(const size_t i) const
Definition: Analyzer.h:1441