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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /src/include/nodes/value.h | |
parent | Initial commit. (diff) | |
download | postgresql-13-6eb9c5a5657d1fe77b55cc261450f3538d35a94d.tar.xz postgresql-13-6eb9c5a5657d1fe77b55cc261450f3538d35a94d.zip |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/include/nodes/value.h')
-rw-r--r-- | src/include/nodes/value.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/include/nodes/value.h b/src/include/nodes/value.h new file mode 100644 index 0000000..d4911b5 --- /dev/null +++ b/src/include/nodes/value.h @@ -0,0 +1,61 @@ +/*------------------------------------------------------------------------- + * + * value.h + * interface for Value nodes + * + * + * Copyright (c) 2003-2020, PostgreSQL Global Development Group + * + * src/include/nodes/value.h + * + *------------------------------------------------------------------------- + */ + +#ifndef VALUE_H +#define VALUE_H + +#include "nodes/nodes.h" + +/*---------------------- + * Value node + * + * The same Value struct is used for five node types: T_Integer, + * T_Float, T_String, T_BitString, T_Null. + * + * Integral values are actually represented by a machine integer, + * but both floats and strings are represented as strings. + * Using T_Float as the node type simply indicates that + * the contents of the string look like a valid numeric literal. + * + * (Before Postgres 7.0, we used a double to represent T_Float, + * but that creates loss-of-precision problems when the value is + * ultimately destined to be converted to NUMERIC. Since Value nodes + * are only used in the parsing process, not for runtime data, it's + * better to use the more general representation.) + * + * Note that an integer-looking string will get lexed as T_Float if + * the value is too large to fit in an 'int'. + * + * Nulls, of course, don't need the value part at all. + *---------------------- + */ +typedef struct Value +{ + NodeTag type; /* tag appropriately (eg. T_String) */ + union ValUnion + { + int ival; /* machine integer */ + char *str; /* string */ + } val; +} Value; + +#define intVal(v) (((Value *)(v))->val.ival) +#define floatVal(v) atof(((Value *)(v))->val.str) +#define strVal(v) (((Value *)(v))->val.str) + +extern Value *makeInteger(int i); +extern Value *makeFloat(char *numericStr); +extern Value *makeString(char *str); +extern Value *makeBitString(char *str); + +#endif /* VALUE_H */ |