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Phase 2 of read-only-plans project: restructure expression-tree nodes
so that all executable expression nodes inherit from a common supertype Expr. This is somewhat of an exercise in code purity rather than any real functional advance, but getting rid of the extra Oper or Func node formerly used in each operator or function call should provide at least a little space and speed improvement. initdb forced by changes in stored-rules representation.
This commit is contained in:
Tom Lane
@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: parsenodes.h,v 1.221 2002/12/06 05:00:32 momjian Exp $
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* $Id: parsenodes.h,v 1.222 2002/12/12 15:49:40 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -34,7 +34,7 @@ typedef enum QuerySource
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/*
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* Query -
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* all statments are turned into a Query tree (via transformStmt)
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* all statements are turned into a Query tree (via transformStmt)
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* for further processing by the optimizer
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* utility statements (i.e. non-optimizable statements)
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* have the *utilityStmt field set.
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@@ -201,145 +201,6 @@ typedef struct TypeCast
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TypeName *typename; /* the target type */
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} TypeCast;
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/*
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* CaseExpr - a CASE expression
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*/
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typedef struct CaseExpr
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{
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NodeTag type;
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Oid casetype;
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Node *arg; /* implicit equality comparison argument */
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List *args; /* the arguments (list of WHEN clauses) */
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Node *defresult; /* the default result (ELSE clause) */
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} CaseExpr;
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/*
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* CaseWhen - an argument to a CASE expression
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*/
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typedef struct CaseWhen
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{
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NodeTag type;
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Node *expr; /* comparison expression */
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Node *result; /* substitution result */
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} CaseWhen;
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/* ----------------
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* NullTest
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*
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* NullTest represents the operation of testing a value for NULLness.
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* Currently, we only support scalar input values, but eventually a
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* row-constructor input should be supported.
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* The appropriate test is performed and returned as a boolean Datum.
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* ----------------
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*/
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typedef enum NullTestType
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{
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IS_NULL, IS_NOT_NULL
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} NullTestType;
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typedef struct NullTest
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{
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NodeTag type;
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Node *arg; /* input expression */
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NullTestType nulltesttype; /* IS NULL, IS NOT NULL */
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} NullTest;
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/*
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* BooleanTest
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*
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* BooleanTest represents the operation of determining whether a boolean
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* is TRUE, FALSE, or UNKNOWN (ie, NULL). All six meaningful combinations
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* are supported. Note that a NULL input does *not* cause a NULL result.
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* The appropriate test is performed and returned as a boolean Datum.
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*/
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typedef enum BoolTestType
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{
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IS_TRUE, IS_NOT_TRUE, IS_FALSE, IS_NOT_FALSE, IS_UNKNOWN, IS_NOT_UNKNOWN
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} BoolTestType;
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typedef struct BooleanTest
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{
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NodeTag type;
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Node *arg; /* input expression */
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BoolTestType booltesttype; /* test type */
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} BooleanTest;
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/*
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* ConstraintTest
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*
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* ConstraintTest represents the operation of testing a value to see whether
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* it meets a constraint. If so, the input value is returned as the result;
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* if not, an error is raised.
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*/
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typedef enum ConstraintTestType
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{
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CONSTR_TEST_NOTNULL,
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CONSTR_TEST_CHECK
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} ConstraintTestType;
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typedef struct ConstraintTest
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{
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NodeTag type;
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Node *arg; /* input expression */
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ConstraintTestType testtype; /* test type */
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char *name; /* name of constraint (for error msgs) */
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char *domname; /* name of domain (for error messages) */
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Node *check_expr; /* for CHECK test, a boolean expression */
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} ConstraintTest;
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/*
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* Placeholder node for the value to be processed by a domains
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* check constraint.
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*/
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typedef struct DomainConstraintValue
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{
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NodeTag type;
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} DomainConstraintValue;
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typedef struct ConstraintTestValue
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{
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NodeTag type;
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Oid typeId;
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int32 typeMod;
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} ConstraintTestValue;
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/*
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* ColumnDef - column definition (used in various creates)
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*
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* If the column has a default value, we may have the value expression
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* in either "raw" form (an untransformed parse tree) or "cooked" form
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* (the nodeToString representation of an executable expression tree),
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* depending on how this ColumnDef node was created (by parsing, or by
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* inheritance from an existing relation). We should never have both
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* in the same node!
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*
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* The constraints list may contain a CONSTR_DEFAULT item in a raw
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* parsetree produced by gram.y, but transformCreateStmt will remove
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* the item and set raw_default instead. CONSTR_DEFAULT items
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* should not appear in any subsequent processing.
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*
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* The "support" field, if not null, denotes a supporting relation that
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* should be linked by an internal dependency to the column. Currently
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* this is only used to link a SERIAL column's sequence to the column.
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*/
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typedef struct ColumnDef
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{
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NodeTag type;
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char *colname; /* name of column */
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TypeName *typename; /* type of column */
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int inhcount; /* number of times column is inherited */
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bool is_local; /* column has local (non-inherited) def'n */
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bool is_not_null; /* NOT NULL constraint specified? */
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Node *raw_default; /* default value (untransformed parse
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* tree) */
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char *cooked_default; /* nodeToString representation */
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List *constraints; /* other constraints on column */
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RangeVar *support; /* supporting relation, if any */
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} ColumnDef;
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/*
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* FuncCall - a function or aggregate invocation
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*
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@@ -414,6 +275,15 @@ typedef struct InsertDefault
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NodeTag type;
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} InsertDefault;
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/*
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* Empty node used as raw-parse-tree representation of VALUE keyword
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* for domain check constraints.
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*/
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typedef struct DomainConstraintValue
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{
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NodeTag type;
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} DomainConstraintValue;
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/*
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* SortGroupBy - for ORDER BY clause
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*/
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@@ -446,6 +316,40 @@ typedef struct RangeFunction
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* assignment of RECORD TupleDesc */
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} RangeFunction;
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/*
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* ColumnDef - column definition (used in various creates)
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*
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* If the column has a default value, we may have the value expression
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* in either "raw" form (an untransformed parse tree) or "cooked" form
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* (the nodeToString representation of an executable expression tree),
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* depending on how this ColumnDef node was created (by parsing, or by
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* inheritance from an existing relation). We should never have both
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* in the same node!
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*
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* The constraints list may contain a CONSTR_DEFAULT item in a raw
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* parsetree produced by gram.y, but transformCreateStmt will remove
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* the item and set raw_default instead. CONSTR_DEFAULT items
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* should not appear in any subsequent processing.
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*
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* The "support" field, if not null, denotes a supporting relation that
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* should be linked by an internal dependency to the column. Currently
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* this is only used to link a SERIAL column's sequence to the column.
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*/
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typedef struct ColumnDef
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{
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NodeTag type;
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char *colname; /* name of column */
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TypeName *typename; /* type of column */
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int inhcount; /* number of times column is inherited */
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bool is_local; /* column has local (non-inherited) def'n */
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bool is_not_null; /* NOT NULL constraint specified? */
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Node *raw_default; /* default value (untransformed parse
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* tree) */
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char *cooked_default; /* nodeToString representation */
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List *constraints; /* other constraints on column */
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RangeVar *support; /* supporting relation, if any */
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} ColumnDef;
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/*
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* IndexElem - index parameters (used in CREATE INDEX)
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*
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@@ -479,21 +383,6 @@ typedef struct DefElem
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* Nodes for a Query tree
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****************************************************************************/
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/*
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* TargetEntry -
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* a target entry (used in the transformed target list)
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*
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* one of resdom or fjoin is not NULL. a target list is
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* ((<resdom | fjoin> expr) (<resdom | fjoin> expr) ...)
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*/
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typedef struct TargetEntry
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{
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NodeTag type;
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Resdom *resdom; /* fjoin overload this to be a list?? */
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Fjoin *fjoin;
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Node *expr;
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} TargetEntry;
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/*--------------------
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* RangeTblEntry -
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* A range table is a List of RangeTblEntry nodes.
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