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43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/******************************************************
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Query graph global types
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(c) 1996 Innobase Oy
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Created 5/27/1996 Heikki Tuuri
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*******************************************************/
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#ifndef que0types_h
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#define que0types_h
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#include "data0data.h"
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#include "dict0types.h"
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/* Pseudotype for all graph nodes */
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typedef void que_node_t;
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typedef struct que_fork_struct que_fork_t;
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/* Query graph root is a fork node */
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typedef que_fork_t que_t;
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typedef struct que_thr_struct que_thr_t;
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typedef struct que_common_struct que_common_t;
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/* Common struct at the beginning of each query graph node; the name of this
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substruct must be 'common' */
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struct que_common_struct{
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ulint type; /* query node type */
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que_node_t* parent; /* back pointer to parent node, or NULL */
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que_node_t* brother;/* pointer to a possible brother node */
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dfield_t val; /* evaluated value for an expression */
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ulint val_buf_size;
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/* buffer size for the evaluated value data,
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if the buffer has been allocated dynamically:
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if this field is != 0, and the node is a
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symbol node or a function node, then we
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have to free the data field in val
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explicitly */
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};
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#endif
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