v35-0006-Add-jsonb-support-function-JsonbUnquote.patch
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Filename: v35-0006-Add-jsonb-support-function-JsonbUnquote.patch
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Part: 5
Message:
Re: remaining sql/json patches
Patch
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API reference →
Format: format-patch
Series: patch v35-0006
Subject: Add jsonb support function JsonbUnquote()
| File | + | − |
|---|---|---|
| src/backend/utils/adt/jsonb.c | 31 | 0 |
| src/include/utils/jsonb.h | 1 | 0 |
From 16f986141d2cd4b07cb4d5bcdacdf8daa24b145a Mon Sep 17 00:00:00 2001
From: Amit Langote <amitlan@postgresql.org>
Date: Thu, 18 Jan 2024 17:57:58 +0900
Subject: [PATCH v35 6/8] Add jsonb support function JsonbUnquote()
As the name says, it's intended to remove quotes from scalar strings
extracted from json(b) values.
Discussion: https://postgr.es/m/CA+HiwqE4XTdfb1nW=Ojoy_tQSRhYt-q_kb6i5d4xcKyrLC1Nbg@mail.gmail.com
---
src/backend/utils/adt/jsonb.c | 31 +++++++++++++++++++++++++++++++
src/include/utils/jsonb.h | 1 +
2 files changed, 32 insertions(+)
diff --git a/src/backend/utils/adt/jsonb.c b/src/backend/utils/adt/jsonb.c
index c10b3fbedf..6d797c0953 100644
--- a/src/backend/utils/adt/jsonb.c
+++ b/src/backend/utils/adt/jsonb.c
@@ -2163,3 +2163,34 @@ jsonb_float8(PG_FUNCTION_ARGS)
PG_RETURN_DATUM(retValue);
}
+
+/*
+ * Convert jsonb to a C-string stripping quotes from scalar strings.
+ */
+char *
+JsonbUnquote(Jsonb *jb)
+{
+ if (JB_ROOT_IS_SCALAR(jb))
+ {
+ JsonbValue v;
+
+ (void) JsonbExtractScalar(&jb->root, &v);
+
+ if (v.type == jbvString)
+ return pnstrdup(v.val.string.val, v.val.string.len);
+ else if (v.type == jbvBool)
+ return pstrdup(v.val.boolean ? "true" : "false");
+ else if (v.type == jbvNumeric)
+ return DatumGetCString(DirectFunctionCall1(numeric_out,
+ PointerGetDatum(v.val.numeric)));
+ else if (v.type == jbvNull)
+ return pstrdup("null");
+ else
+ {
+ elog(ERROR, "unrecognized jsonb value type %d", v.type);
+ return NULL;
+ }
+ }
+ else
+ return JsonbToCString(NULL, &jb->root, VARSIZE(jb));
+}
diff --git a/src/include/utils/jsonb.h b/src/include/utils/jsonb.h
index e38dfd4901..d589ace5a2 100644
--- a/src/include/utils/jsonb.h
+++ b/src/include/utils/jsonb.h
@@ -422,6 +422,7 @@ extern char *JsonbToCString(StringInfo out, JsonbContainer *in,
int estimated_len);
extern char *JsonbToCStringIndent(StringInfo out, JsonbContainer *in,
int estimated_len);
+extern char *JsonbUnquote(Jsonb *jb);
extern bool JsonbExtractScalar(JsonbContainer *jbc, JsonbValue *res);
extern const char *JsonbTypeName(JsonbValue *val);
--
2.35.3