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-rw-r--r--src/backend/parser/scan.l5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/backend/parser/scan.l b/src/backend/parser/scan.l
index 5eaadf53b20..b499975e9c4 100644
--- a/src/backend/parser/scan.l
+++ b/src/backend/parser/scan.l
@@ -419,8 +419,9 @@ bininteger_junk {bininteger}{ident_start}
numeric_junk {numeric}{ident_start}
real_junk {real}{ident_start}
-param \${decinteger}
-param_junk \${decinteger}{ident_start}
+/* Positional parameters don't accept underscores. */
+param \${decdigit}+
+param_junk \${decdigit}+{ident_start}
other .