MySQL 8.0.30
Source Code Documentation
opt_explain_traditional.h
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22
23#ifndef OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
24#define OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
25
26#include <assert.h>
27// assert
30
31class Item;
32class Query_result;
34template <class T>
35class mem_root_deque;
36
37/**
38 Formatter for the traditional EXPLAIN output
39*/
40
42 class Item_null *nil;
43 qep_row column_buffer; ///< buffer for the current output row
44
45 public:
47
48 bool is_hierarchical() const override { return false; }
49 bool send_headers(Query_result *result) override;
51 const Explain_format_flags *) override {
52 return false;
53 }
54 bool end_context(enum_parsing_context) override { return false; }
55 bool flush_entry() override;
56 qep_row *entry() override { return &column_buffer; }
57
58 private:
60};
61
63 public:
65
66 bool is_hierarchical() const override { return false; }
67 bool send_headers(Query_result *) override {
68 assert(false);
69 return true;
70 }
72 const Explain_format_flags *) override {
73 assert(false);
74 return true;
75 }
77 assert(false);
78 return true;
79 }
80 bool flush_entry() override {
81 assert(false);
82 return true;
83 }
84 qep_row *entry() override {
85 assert(false);
86 return nullptr;
87 }
88 bool is_tree() const override { return true; }
89
90 private:
92};
93
94#endif // OPT_EXPLAIN_FORMAT_TRADITIONAL_INCLUDED
Definition: opt_explain_format.h:448
Formatter for the traditional EXPLAIN output.
Definition: opt_explain_traditional.h:41
bool flush_entry() override
Flush TABLE/JOIN_TAB property set.
Definition: opt_explain_traditional.cc:217
qep_row column_buffer
buffer for the current output row
Definition: opt_explain_traditional.h:43
Explain_format_traditional()
Definition: opt_explain_traditional.h:46
class Item_null * nil
Definition: opt_explain_traditional.h:42
bool begin_context(enum_parsing_context, Query_expression *, const Explain_format_flags *) override
Enter a specified context.
Definition: opt_explain_traditional.h:50
qep_row * entry() override
Get a pointer to the current TABLE/JOIN_TAB property set.
Definition: opt_explain_traditional.h:56
bool is_hierarchical() const override
A hierarchical text or a plain table.
Definition: opt_explain_traditional.h:48
bool send_headers(Query_result *result) override
Send EXPLAIN header item(s) to output stream.
Definition: opt_explain_traditional.cc:88
bool push_select_type(mem_root_deque< Item * > *items)
Definition: opt_explain_traditional.cc:179
bool end_context(enum_parsing_context) override
Leave the current context.
Definition: opt_explain_traditional.h:54
Definition: opt_explain_traditional.h:62
bool end_context(enum_parsing_context) override
Leave the current context.
Definition: opt_explain_traditional.h:76
bool send_headers(Query_result *) override
Send EXPLAIN header item(s) to output stream.
Definition: opt_explain_traditional.h:67
bool push_select_type(mem_root_deque< Item * > *items)
bool flush_entry() override
Flush TABLE/JOIN_TAB property set.
Definition: opt_explain_traditional.h:80
qep_row * entry() override
Get a pointer to the current TABLE/JOIN_TAB property set.
Definition: opt_explain_traditional.h:84
Explain_format_tree()=default
bool is_hierarchical() const override
A hierarchical text or a plain table.
Definition: opt_explain_traditional.h:66
bool is_tree() const override
Definition: opt_explain_traditional.h:88
bool begin_context(enum_parsing_context, Query_expression *, const Explain_format_flags *) override
Enter a specified context.
Definition: opt_explain_traditional.h:71
Base class for structured and hierarchical EXPLAIN output formatters.
Definition: opt_explain_format.h:503
Definition: item.h:4384
Base class that is used to represent any kind of expression in a relational query.
Definition: item.h:802
This class represents a query expression (one query block or several query blocks combined with UNION...
Definition: sql_lex.h:629
Definition: query_result.h:51
A (partial) implementation of std::deque allocating its blocks on a MEM_ROOT.
Definition: mem_root_deque.h:109
Helper class for table property buffering.
Definition: opt_explain_format.h:146
Fido Client Authentication nullptr
Definition: fido_client_plugin.cc:221
EXPLAIN FORMAT=<format> <command>.
enum_parsing_context
Names for different query parse tree parts.
Definition: parse_tree_node_base.h:55
Definition: result.h:29