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WITH support in MERGE

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Author: Peter Geoghegan
Recursive support removed, no tests
Docs added by me
This commit is contained in:
Simon Riggs
2018-04-03 12:13:59 +01:00
parent 83454e3c2b
commit aa3faa3c7a
10 changed files with 232 additions and 9 deletions
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1
src/backend/nodes/copyfuncs.c
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@@ -3055,6 +3055,7 @@ _copyMergeStmt(const MergeStmt *from)
COPY_NODE_FIELD(source_relation);
COPY_NODE_FIELD(join_condition);
COPY_NODE_FIELD(mergeActionList);
COPY_NODE_FIELD(withClause);
return newnode;
}

1
src/backend/nodes/equalfuncs.c
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@@ -1051,6 +1051,7 @@ _equalMergeStmt(const MergeStmt *a, const MergeStmt *b)
COMPARE_NODE_FIELD(source_relation);
COMPARE_NODE_FIELD(join_condition);
COMPARE_NODE_FIELD(mergeActionList);
COMPARE_NODE_FIELD(withClause);
return true;
}

2
src/backend/nodes/nodeFuncs.c
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@@ -3446,6 +3446,8 @@ raw_expression_tree_walker(Node *node,
return true;
if (walker(stmt->mergeActionList, context))
return true;
if (walker(stmt->withClause, context))
return true;
}
break;
case T_MergeAction:

11
src/backend/parser/gram.y
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@@ -11105,17 +11105,18 @@ set_target_list:
*****************************************************************************/
MergeStmt:
MERGE INTO relation_expr_opt_alias
opt_with_clause MERGE INTO relation_expr_opt_alias
USING table_ref
ON a_expr
merge_when_list
{
MergeStmt *m = makeNode(MergeStmt);
m->relation = $3;
m->source_relation = $5;
m->join_condition = $7;
m->mergeActionList = $8;
m->withClause = $1;
m->relation = $4;
m->source_relation = $6;
m->join_condition = $8;
m->mergeActionList = $9;
$$ = (Node *)m;
}

14
src/backend/parser/parse_merge.c
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@@ -24,6 +24,7 @@
#include "parser/parsetree.h"
#include "parser/parser.h"
#include "parser/parse_clause.h"
#include "parser/parse_cte.h"
#include "parser/parse_merge.h"
#include "parser/parse_relation.h"
#include "parser/parse_target.h"
@@ -202,6 +203,19 @@ transformMergeStmt(ParseState *pstate, MergeStmt *stmt)
Assert(pstate->p_ctenamespace == NIL);
qry->commandType = CMD_MERGE;
qry->hasRecursive = false;
/* process the WITH clause independently of all else */
if (stmt->withClause)
{
if (stmt->withClause->recursive)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("WITH RECURSIVE is not supported for MERGE statement")));
qry->cteList = transformWithClause(pstate, stmt->withClause);
qry->hasModifyingCTE = pstate->p_hasModifyingCTE;
}
/*
* Check WHEN clauses for permissions and sanity