mirror of https://github.com/citusdata/citus.git
Adds JSON table functions in ruleutils_15.c
Relevant PG commit: 4e34747c88a03ede6e9d731727815e37273d4bc9boolean_node
naisila
parent
c71d940093
commit
abb198b757
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@ -462,6 +462,8 @@ static char *generate_function_name(Oid funcid, int nargs,
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ParseExprKind special_exprkind);
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static void get_json_path_spec(Node *path_spec, deparse_context *context,
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bool showimplicit);
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static void get_json_table_columns(TableFunc *tf, JsonTableParent *node,
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deparse_context *context, bool showimplicit);
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#define only_marker(rte) ((rte)->inh ? "" : "ONLY ")
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@ -5239,7 +5241,8 @@ get_json_behavior(JsonBehavior *behavior, deparse_context *context,
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/*
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* get_json_expr_options
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*
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* Parse back common options for JSON_QUERY, JSON_VALUE, JSON_EXISTS.
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* Parse back common options for JSON_QUERY, JSON_VALUE, JSON_EXISTS and
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* JSON_TABLE columns.
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*/
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static void
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get_json_expr_options(JsonExpr *jsexpr, deparse_context *context,
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@ -6507,6 +6510,9 @@ get_rule_expr(Node *node, deparse_context *context,
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case JSON_EXISTS_OP:
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appendStringInfoString(buf, "JSON_EXISTS(");
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break;
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default:
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elog(ERROR, "unexpected JsonExpr type: %d", jexpr->op);
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break;
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}
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get_rule_expr(jexpr->formatted_expr, context, showimplicit);
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@ -7830,16 +7836,14 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
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/* ----------
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* get_tablefunc - Parse back a table function
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* get_xmltable - Parse back a XMLTABLE function
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* ----------
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*/
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static void
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get_tablefunc(TableFunc *tf, deparse_context *context, bool showimplicit)
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get_xmltable(TableFunc *tf, deparse_context *context, bool showimplicit)
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{
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StringInfo buf = context->buf;
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/* XMLTABLE is the only existing implementation. */
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appendStringInfoString(buf, "XMLTABLE(");
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if (tf->ns_uris != NIL)
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@ -7930,6 +7934,220 @@ get_tablefunc(TableFunc *tf, deparse_context *context, bool showimplicit)
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appendStringInfoChar(buf, ')');
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}
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/*
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* get_json_nested_columns - Parse back nested JSON_TABLE columns
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*/
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static void
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get_json_table_nested_columns(TableFunc *tf, Node *node,
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deparse_context *context, bool showimplicit,
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bool needcomma)
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{
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if (IsA(node, JsonTableSibling))
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{
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JsonTableSibling *n = (JsonTableSibling *) node;
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get_json_table_nested_columns(tf, n->larg, context, showimplicit,
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needcomma);
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get_json_table_nested_columns(tf, n->rarg, context, showimplicit, true);
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}
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else
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{
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JsonTableParent *n = castNode(JsonTableParent, node);
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if (needcomma)
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appendStringInfoChar(context->buf, ',');
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appendStringInfoChar(context->buf, ' ');
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appendContextKeyword(context, "NESTED PATH ", 0, 0, 0);
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get_const_expr(n->path, context, -1);
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get_json_table_columns(tf, n, context, showimplicit);
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}
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}
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/*
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* get_json_table_columns - Parse back JSON_TABLE columns
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*/
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static void
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get_json_table_columns(TableFunc *tf, JsonTableParent *node,
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deparse_context *context, bool showimplicit)
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{
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StringInfo buf = context->buf;
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JsonExpr *jexpr = castNode(JsonExpr, tf->docexpr);
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ListCell *lc_colname;
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ListCell *lc_coltype;
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ListCell *lc_coltypmod;
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ListCell *lc_colvarexpr;
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int colnum = 0;
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appendStringInfoChar(buf, ' ');
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appendContextKeyword(context, "COLUMNS (", 0, 0, 0);
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if (PRETTY_INDENT(context))
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context->indentLevel += PRETTYINDENT_VAR;
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forfour(lc_colname, tf->colnames,
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lc_coltype, tf->coltypes,
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lc_coltypmod, tf->coltypmods,
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lc_colvarexpr, tf->colvalexprs)
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{
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char *colname = strVal(lfirst(lc_colname));
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JsonExpr *colexpr;
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Oid typid;
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int32 typmod;
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bool ordinality;
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JsonBehaviorType default_behavior;
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typid = lfirst_oid(lc_coltype);
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typmod = lfirst_int(lc_coltypmod);
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colexpr = castNode(JsonExpr, lfirst(lc_colvarexpr));
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if (colnum < node->colMin)
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{
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colnum++;
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continue;
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}
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if (colnum > node->colMax)
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break;
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if (colnum > node->colMin)
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appendStringInfoString(buf, ", ");
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colnum++;
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ordinality = !colexpr;
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appendContextKeyword(context, "", 0, 0, 0);
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appendStringInfo(buf, "%s %s", quote_identifier(colname),
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ordinality ? "FOR ORDINALITY" :
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format_type_with_typemod(typid, typmod));
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if (ordinality)
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continue;
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if (colexpr->op == JSON_EXISTS_OP)
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{
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appendStringInfoString(buf, " EXISTS");
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default_behavior = JSON_BEHAVIOR_FALSE;
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}
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else
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{
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if (colexpr->op == JSON_QUERY_OP)
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{
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char typcategory;
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bool typispreferred;
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get_type_category_preferred(typid, &typcategory, &typispreferred);
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if (typcategory == TYPCATEGORY_STRING)
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appendStringInfoString(buf,
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colexpr->format->format_type == JS_FORMAT_JSONB ?
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" FORMAT JSONB" : " FORMAT JSON");
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}
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default_behavior = JSON_BEHAVIOR_NULL;
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}
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if (jexpr->on_error->btype == JSON_BEHAVIOR_ERROR)
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default_behavior = JSON_BEHAVIOR_ERROR;
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appendStringInfoString(buf, " PATH ");
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get_json_path_spec(colexpr->path_spec, context, showimplicit);
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get_json_expr_options(colexpr, context, default_behavior);
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}
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if (node->child)
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get_json_table_nested_columns(tf, node->child, context, showimplicit,
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node->colMax >= node->colMin);
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if (PRETTY_INDENT(context))
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context->indentLevel -= PRETTYINDENT_VAR;
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appendContextKeyword(context, ")", 0, 0, 0);
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}
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/* ----------
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* get_json_table - Parse back a JSON_TABLE function
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* ----------
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*/
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static void
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get_json_table(TableFunc *tf, deparse_context *context, bool showimplicit)
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{
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StringInfo buf = context->buf;
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JsonExpr *jexpr = castNode(JsonExpr, tf->docexpr);
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JsonTableParent *root = castNode(JsonTableParent, tf->plan);
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appendStringInfoString(buf, "JSON_TABLE(");
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if (PRETTY_INDENT(context))
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context->indentLevel += PRETTYINDENT_VAR;
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appendContextKeyword(context, "", 0, 0, 0);
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get_rule_expr(jexpr->formatted_expr, context, showimplicit);
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appendStringInfoString(buf, ", ");
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get_const_expr(root->path, context, -1);
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if (jexpr->passing_values)
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{
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ListCell *lc1, *lc2;
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bool needcomma = false;
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appendStringInfoChar(buf, ' ');
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appendContextKeyword(context, "PASSING ", 0, 0, 0);
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if (PRETTY_INDENT(context))
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context->indentLevel += PRETTYINDENT_VAR;
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forboth(lc1, jexpr->passing_names,
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lc2, jexpr->passing_values)
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{
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if (needcomma)
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appendStringInfoString(buf, ", ");
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needcomma = true;
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appendContextKeyword(context, "", 0, 0, 0);
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get_rule_expr((Node *) lfirst(lc2), context, false);
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appendStringInfo(buf, " AS %s",
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quote_identifier((lfirst_node(String, lc1))->sval)
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);
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}
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if (PRETTY_INDENT(context))
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context->indentLevel -= PRETTYINDENT_VAR;
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}
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get_json_table_columns(tf, root, context, showimplicit);
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if (jexpr->on_error->btype != JSON_BEHAVIOR_EMPTY)
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get_json_behavior(jexpr->on_error, context, "ERROR");
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if (PRETTY_INDENT(context))
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context->indentLevel -= PRETTYINDENT_VAR;
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appendContextKeyword(context, ")", 0, 0, 0);
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}
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/* ----------
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* get_tablefunc - Parse back a table function
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* ----------
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*/
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static void
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get_tablefunc(TableFunc *tf, deparse_context *context, bool showimplicit)
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{
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/* XMLTABLE and JSON_TABLE are the only existing implementations. */
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if (tf->functype == TFT_XMLTABLE)
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get_xmltable(tf, context, showimplicit);
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else if (tf->functype == TFT_JSON_TABLE)
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get_json_table(tf, context, showimplicit);
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}
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/* ----------
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* get_from_clause - Parse back a FROM clause
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*
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